ARM: multi_v7_defconfig: Add Atmel Flexcom device

The Flexcom device has been introduced with Atmel SAMA5D2 SoC.
Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

arch/arm/configs/multi_v7_defconfig

@@ -383,6 +383,7 @@ CONFIG_MESON_WATCHDOG=y
 CONFIG_DIGICOLOR_WATCHDOG=y
 CONFIG_MFD_AS3711=y
 CONFIG_MFD_AS3722=y
+CONFIG_MFD_ATMEL_FLEXCOM=y
 CONFIG_MFD_BCM590XX=y
 CONFIG_MFD_AXP20X=y
 CONFIG_MFD_CROS_EC=y