stm32l4: Correct memorymap and add the existing CAN library

include/libopencm3/stm32/l4/memorymap.h

@@ -57,7 +57,7 @@
 #define I2C2_BASE			(PERIPH_BASE_APB1 + 0x5800)
 #define I2C3_BASE			(PERIPH_BASE_APB1 + 0x5c00)
 #define CRS_BASE			(PERIPH_BASE_APB1 + 0x6000)
-#define CAN1_BASE			(PERIPH_BASE_APB1 + 0x6400)
+#define BX_CAN1_BASE			(PERIPH_BASE_APB1 + 0x6400)
 #define USB_DEV_FS_BASE			(PERIPH_BASE_APB1 + 0x6800)
 #define USB_PMA_BASE			(PERIPH_BASE_APB1 + 0x6c00)
 #define POWER_CONTROL_BASE		(PERIPH_BASE_APB1 + 0x7000)

lib/stm32/l4/Makefile

@@ -38,7 +38,7 @@ TGT_CFLAGS	+= $(STANDARD_FLAGS)
 ARFLAGS		= rcs
 
 # Specific objs
-OBJS		= adc.o flash.o pwr.o rcc.o
+OBJS		= adc.o flash.o pwr.o rcc.o can.o
 
 # common/shared objs
 OBJS            += rcc_common_all.o