ARM: configs: at91: add MCAN driver to sama5_defconfig

Add the Controller Area Network (MCAN) driver compilation
for sama5 default configuration. Is used by sama5d2 SoC for instance.
Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

arch/arm/configs/sama5_defconfig

@@ -54,6 +54,7 @@ CONFIG_IP_PNP_RARP=y
 CONFIG_IPV6_SIT_6RD=y
 CONFIG_CAN=y
 CONFIG_CAN_AT91=y
+CONFIG_CAN_M_CAN=y
 CONFIG_CFG80211=y
 CONFIG_MAC80211=y
 CONFIG_MAC80211_LEDS=y