STM32F0: create STM32F091xC target

Author: jeromecoutant

targets/TARGET_STM/TARGET_STM32F0/TARGET_NUCLEO_F091RC/PeripheralNames.h renamed to targets/TARGET_STM/TARGET_STM32F0/TARGET_STM32F091xC/TARGET_NUCLEO_F091RC/PeripheralNames.h

@@ -63,7 +63,7 @@
        defined(TARGET_STM32L0x2xZ))
 #define INITIAL_SP              (0x20005000UL)
 
-#elif (defined(TARGET_STM32F091RC) ||\
+#elif (defined(TARGET_STM32F091xC) ||\
        defined(TARGET_STM32F410RB) ||\
        defined(TARGET_STM32L151CBA)||\
        defined(TARGET_STM32L151CC) ||\

targets/TARGET_STM/TARGET_STM32F0/TARGET_NUCLEO_F091RC/PeripheralPins.c renamed to targets/TARGET_STM/TARGET_STM32F0/TARGET_STM32F091xC/TARGET_NUCLEO_F091RC/PeripheralPins.c

@@ -2286,7 +2286,10 @@
         "inherits": ["FAMILY_STM32"],
         "supported_form_factors": ["ARDUINO", "MORPHO"],
         "core": "Cortex-M0",
-        "extra_labels_add": ["STM32F0", "STM32F091RC"],
+        "extra_labels_add": [
+            "STM32F0",
+            "STM32F091xC"
+        ],
         "config": {
             "clock_source": {
                 "help": "Mask value : USE_PLL_HSE_EXTC | USE_PLL_HSE_XTAL (need HW patch) | USE_PLL_HSI",