Incorporating review comments

Removing USBDEVICE since USB pins are NOT brought out on the MTB/MCB.

Author: Ashok Rao

components/802.15.4_RF/stm-s2lp-rf-driver/mbed_lib.json

@@ -4,6 +4,11 @@
         "provide-default": {
             "help": "Provide default NanostackRfpy. [true/false]",
             "value": false
+        },
+    "target_overrides": {
+        "MTB_STM_S2LP": {
+           "s2lp.provide-default": true
+         }
         }
     }
 }

targets/targets.json

@@ -2834,11 +2834,16 @@
                 "help": "Mask value : USE_PLL_HSE_EXTC | USE_PLL_HSE_XTAL (8MHz) | USE_PLL_HSI",
                 "value": "USE_PLL_HSE_XTAL",
                 "macro_name": "CLOCK_SOURCE"
+            },
+            "clock_source_usb": {
+                "help": "As 48 Mhz clock is configured for USB, SYSCLK has to be reduced from 180 to 168 MHz (set 0 for the max SYSCLK value)",
+                "value": "1",
+                "macro_name": "CLOCK_SOURCE_USB"
             }
         },
         "extra_labels_add": ["STM32F4", "STM32F429", "STM32F429ZI", "STM32F429xx", "STM32F429xI"],
         "macros_add": ["USB_STM_HAL"],
-        "device_has_add": ["ANALOGOUT", "CAN", "SERIAL_ASYNCH", "TRNG", "FLASH", "MPU", "USBDEVICE"],
+        "device_has_add": ["ANALOGOUT", "CAN", "SERIAL_ASYNCH", "TRNG", "FLASH", "MPU"],
         "detect_code": ["0467"],
         "release_versions": ["5"],
         "device_name": "STM32F429ZI",