ARM64: defconfig: enable DRM_MESON as module

Signed-off-by: Kevin Hilman <khilman@baylibre.com>

arch/arm64/configs/defconfig

@@ -331,6 +331,7 @@ CONFIG_DRM_VC4=m
 CONFIG_DRM_PANEL_SIMPLE=m
 CONFIG_DRM_I2C_ADV7511=m
 CONFIG_DRM_HISI_KIRIN=m
+CONFIG_DRM_MESON=m
 CONFIG_FB=y
 CONFIG_FB_ARMCLCD=y
 CONFIG_BACKLIGHT_GENERIC=m