ARM: configs: at91: Enable AUTOFS_FS required by systemd

Align all at91 defconfigs to required options for systemd.
The missing of autofs would cause warnings on boot
when not available.
Suggested-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>

arch/arm/configs/sama5_defconfig

@@ -222,6 +222,7 @@ CONFIG_PWM_ATMEL_HLCDC_PWM=y
 CONFIG_PWM_ATMEL_TCB=y
 CONFIG_EXT4_FS=y
 CONFIG_FANOTIFY=y
+CONFIG_AUTOFS_FS=m
 CONFIG_VFAT_FS=y
 CONFIG_TMPFS=y
 CONFIG_UBIFS_FS=y

arch/arm/configs/sama7_defconfig

@@ -200,6 +200,7 @@ CONFIG_RESET_CONTROLLER=y
 CONFIG_EXT2_FS=y
 CONFIG_EXT3_FS=y
 CONFIG_FANOTIFY=y
+CONFIG_AUTOFS_FS=m
 CONFIG_VFAT_FS=y
 CONFIG_TMPFS=y
 CONFIG_UBIFS_FS=y