ARM: configs: at91_dt_defconfig: add ov7740 module

Add OV7740 as a module as it's useful testing camera sensors on
sam9x60ek for instance. Unify with sama5_defconfig as well.
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>

arch/arm/configs/at91_dt_defconfig

@@ -134,6 +134,7 @@ CONFIG_MEDIA_PLATFORM_SUPPORT=y
 CONFIG_V4L_PLATFORM_DRIVERS=y
 CONFIG_VIDEO_ATMEL_ISI=y
 CONFIG_VIDEO_OV2640=m
+CONFIG_VIDEO_OV7740=m
 CONFIG_VIDEO_MT9V032=m
 CONFIG_DRM=y
 CONFIG_DRM_ATMEL_HLCDC=y