Remove FEATURE_LWIP. The LwIP stack is enabled on all builds now

Leave the FEATURE_LWIP enabled in build scripts so that it does
not break any builds.

Removed 'feature_add: ["LWIP"]' on all targets.

Author: Seppo Takalo

doxyfile_options

@@ -845,7 +845,7 @@ EXCLUDE_PATTERNS       = */tools/* \
                          */features/mbedtls/* \
                          */features/storage/* \
                          */features/unsupported/* \
-                         */features/FEATURE_LWIP/* \
+                         */features/lwipstack/* \
                          */features/FEATURE_UVISOR/* \
                          */features/nanostack/sal-stack-nanostack/* \
                          */features/nanostack/coap-service/* \

doxygen_options.json

@@ -4,11 +4,11 @@
     "MACRO_EXPANSION": "YES",
     "EXPAND_ONLY_PREDEF": "NO",
     "SEARCH_INCLUDES": "YES",
-    "INCLUDE_PATH": "", 
-    "INCLUDE_FILE_PATTERNS": "", 
+    "INCLUDE_PATH": "",
+    "INCLUDE_FILE_PATTERNS": "",
     "PREDEFINED": "DOXYGEN_ONLY DEVICE_ANALOGIN DEVICE_ANALOGOUT DEVICE_CAN DEVICE_CRC DEVICE_ETHERNET DEVICE_EMAC DEVICE_FLASH  DEVICE_I2C DEVICE_I2CSLAVE DEVICE_I2C_ASYNCH DEVICE_INTERRUPTIN DEVICE_ITM DEVICE_LPTICKER DEVICE_PORTIN DEVICE_PORTINOUT DEVICE_PORTOUT DEVICE_PWMOUT DEVICE_RTC DEVICE_TRNG DEVICE_SERIAL DEVICE_SERIAL_ASYNCH DEVICE_SERIAL_FC DEVICE_SLEEP DEVICE_SPI DEVICE_SPI_ASYNCH DEVICE_SPISLAVE DEVICE_STORAGE \"MBED_DEPRECATED_SINCE(f, g)=\" \"MBED_ENABLE_IF_CALLBACK_COMPATIBLE(F, M)=\" \"MBED_DEPRECATED(s)=\"",
-    "EXPAND_AS_DEFINED": "", 
+    "EXPAND_AS_DEFINED": "",
     "SKIP_FUNCTION_MACROS": "NO",
     "STRIP_CODE_COMMENTS": "NO",
-    "EXCLUDE_PATTERNS": "*/tools/* */targets/* */features/mbedtls/* */features/storage/* */features/unsupported/* */BUILD/* */rtos/TARGET_CORTEX/rtx*/* */cmsis/* */features/FEATURE_LWIP/* */features/FEATURE_UVISOR/* */nanostack/sal-stack-nanostack/* */nanostack/coap-service/* */ble/generic/* */ble/pal/*  */mbed-trace/* */mbed-coap/* */nanostack-libservice/* */mbed-client-randlib/* */nanostack/sal-stack-nanostack-eventloop/*"
+    "EXCLUDE_PATTERNS": "*/tools/* */targets/* */features/mbedtls/* */features/storage/* */features/unsupported/* */BUILD/* */rtos/TARGET_CORTEX/rtx*/* */cmsis/* */features/lwipstack/* */features/FEATURE_UVISOR/* */nanostack/sal-stack-nanostack/* */nanostack/coap-service/* */ble/generic/* */ble/pal/*  */mbed-trace/* */mbed-coap/* */nanostack-libservice/* */mbed-client-randlib/* */nanostack/sal-stack-nanostack-eventloop/*"
 }