ARM: multi_v7: enable VGA bridge

Enable the RGB to VGA bridge driver in the defconfig
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/configs/multi_v7_defconfig

@@ -572,6 +572,7 @@ CONFIG_DRM=y
 CONFIG_DRM_I2C_ADV7511=m
 # CONFIG_DRM_I2C_CH7006 is not set
 # CONFIG_DRM_I2C_SIL164 is not set
+CONFIG_DRM_DUMB_VGA_DAC=m
 CONFIG_DRM_NXP_PTN3460=m
 CONFIG_DRM_PARADE_PS8622=m
 CONFIG_DRM_NOUVEAU=m