Added CAN API for STM32F7xx family

Change-Id: I0f04f28d0d737e01eff737dfcab375c155d4f704

Author: BartSX

hal/targets/hal/TARGET_STM/TARGET_STM32F7/PeripheralPins.h

@@ -63,4 +63,8 @@ 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