CMD: Drop CMD_CAN, it's not used

$ git grep CMD_CAN
include/configs/jadecpu.h:#define CONFIG_CMD_CAN
Signed-off-by: NMarek Vasut <marex@denx.de>
Cc: Matthias Weisser <weisserm@arcor.de>

include/configs/jadecpu.h

@@ -130,7 +130,6 @@
 #undef CONFIG_CMD_XIMG
 
 #define CONFIG_CMD_BMP
-#define CONFIG_CMD_CAN
 #define CONFIG_CMD_DHCP
 #define CONFIG_CMD_ELF
 #define CONFIG_CMD_FAT