Added CAN API for STM32F0xx family

* STM32F0xx family have only one CAN bus

Change-Id: Id17fbfb825fabe04725a829a121300290f074919

Author: BartSX

libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32F0/PeripheralPins.h

@@ -63,4 +63,9 @@ extern const PinMap PinMap_SPI_MISO[];
 extern const PinMap PinMap_SPI_SCLK[];
 extern const PinMap PinMap_SPI_SSEL[];
 
+//*** CAN ***
+
+extern const PinMap PinMap_CAN_RD[];
+extern const PinMap PinMap_CAN_TD[];
+
 #endif