Merge pull request ARMmbed#14259 from rotu/G431RB

Support STM Nucleo-G431RB

Author: 0xc0170

targets/TARGET_STM/TARGET_STM32G4/TARGET_STM32G431xB/CMakeLists.txt

@@ -2,6 +2,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 add_subdirectory(TARGET_NUCLEO_G431KB EXCLUDE_FROM_ALL)
+add_subdirectory(TARGET_NUCLEO_G431RB EXCLUDE_FROM_ALL)
 
 if(${MBED_TOOLCHAIN} STREQUAL "GCC_ARM")
     set(STARTUP_FILE TOOLCHAIN_GCC_ARM/startup_stm32g431xx.S)

targets/TARGET_STM/TARGET_STM32G4/TARGET_STM32G431xB/TARGET_NUCLEO_G431RB/CMakeLists.txt

@@ -0,0 +1,16 @@
+# Copyright (c) 2021 ARM Limited. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+
+add_library(mbed-nucleo-g431rb INTERFACE)
+
+target_sources(mbed-nucleo-g431rb 
+    INTERFACE
+        PeripheralPins.c
+)
+
+target_include_directories(mbed-nucleo-g431rb 
+    INTERFACE
+        .
+)
+
+target_link_libraries(mbed-nucleo-g431rb INTERFACE mbed-stm32g431xb)