CellularBase -> CellularInterface tidy

Remove remaining references to deprecated CellularBase in code, avoiding
one warning.

Optimise by removing separate virtual function entries for
NetworkInterface::cellularBase and NetworkInterface::cellularInterface

Author: kjbracey

features/netsocket/CellularInterface.h

@@ -116,14 +116,6 @@ class CellularInterface: public NetworkInterface {
      */
     virtual const char *get_gateway() = 0;
 
-    /** @copydoc NetworkInterface::cellularBase
-     */
-    MBED_DEPRECATED_SINCE("mbed-os-5.12", "Migrated to CellularInterface")
-    virtual CellularInterface *cellularBase()
-    {
-        return this;
-    }
-
     /** @copydoc NetworkInterface::cellularInterface
      */
     virtual CellularInterface *cellularInterface()

features/netsocket/NetworkInterface.h

@@ -51,7 +51,7 @@ class NetworkInterface: public DNS {
      * target.network-default-interface-type or other overrides.
      *
      * The type of the interface returned can be tested by calling ethInterface(),
-     * wifiInterface(), meshInterface(), cellularBase(), emacInterface() and checking
+     * wifiInterface(), meshInterface(), cellularInterface(), emacInterface() and checking
      * for NULL pointers.
      *
      * The default behavior is to return the default interface for the
@@ -341,12 +341,19 @@ class NetworkInterface: public DNS {
     /** Return pointer to a CellularInterface.
      * @return Pointer to requested interface type or NULL if this class doesn't implement the interface.
      */
-    MBED_DEPRECATED_SINCE("mbed-os-5.12", "Migrated to CellularInterface")
-    virtual CellularInterface *cellularBase()
+    virtual CellularInterface *cellularInterface()
     {
         return 0;
     }
 
+    /** Return pointer to a CellularBase.
+     * @return Pointer to requested interface type or NULL if this class doesn't implement the interface.
+     */
+    MBED_DEPRECATED_SINCE("mbed-os-5.12", "Migrated to CellularInterface")
+    CellularInterface *cellularBase() {
+        return cellularInterface();
+    }
+
     /** Return pointer to an EMACInterface.
      * @return Pointer to requested interface type or NULL if this class doesn't implement the interface.
      */
@@ -415,14 +422,6 @@ class NetworkInterface: public DNS {
      * configuration).
      */
     virtual void set_default_parameters();
-
-    /** Return pointer to a CellularInterface.
-     * @return Pointer to requested interface type or NULL if this class doesn't implement the interface.
-     */
-    virtual CellularInterface *cellularInterface()
-    {
-        return 0;
-    }
 };
 
 #endif

features/netsocket/NetworkInterfaceDefaults.cpp

@@ -18,7 +18,7 @@
 
 #include "EthInterface.h"
 #include "WiFiInterface.h"
-#include "CellularBase.h"
+#include "CellularInterface.h"
 #include "MeshInterface.h"
 
 /* Weak default instance static classes for the various abstract classes.
@@ -40,7 +40,7 @@ MBED_WEAK MeshInterface *MeshInterface::get_default_instance()
     return get_target_default_instance();
 }
 
-MBED_WEAK CellularBase *CellularBase::get_default_instance()
+MBED_WEAK CellularInterface *CellularInterface::get_default_instance()
 {
     return get_target_default_instance();
 }
@@ -87,9 +87,9 @@ void WiFiInterface::set_default_parameters()
 #endif
 }
 
-void CellularBase::set_default_parameters()
+void CellularInterface::set_default_parameters()
 {
-    /* CellularBase is expected to attempt to work without any parameters - we
+    /* CellularInterface is expected to attempt to work without any parameters - we
      * will try, at least.
      */
 #ifdef MBED_CONF_NSAPI_DEFAULT_CELLULAR_APN
@@ -148,7 +148,7 @@ MBED_WEAK NetworkInterface *NetworkInterface::get_target_default_instance()
 #elif MBED_CONF_TARGET_NETWORK_DEFAULT_INTERFACE_TYPE == CELLULAR
 MBED_WEAK NetworkInterface *NetworkInterface::get_target_default_instance()
 {
-    CellularBase *cellular = CellularBase::get_default_instance();
+    CellularInterface *cellular = CellularInterface::get_default_instance();
     if (!cellular) {
         return NULL;
     }