drm/meson: Add G12A compatible

Finally add the Amlogic G12A SoC compatible for the VPU driver.
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Tested-by: Jerome Brunet <jbrunet@baylibre.com>
Reviewed-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190325141824.21259-11-narmstrong@baylibre.com

drivers/gpu/drm/meson/meson_drv.c

@@ -444,6 +444,7 @@ static const struct of_device_id dt_match[] = {
 	{ .compatible = "amlogic,meson-gxbb-vpu" },
 	{ .compatible = "amlogic,meson-gxl-vpu" },
 	{ .compatible = "amlogic,meson-gxm-vpu" },
+	{ .compatible = "amlogic,meson-g12a-vpu" },
 	{}
 };
 MODULE_DEVICE_TABLE(of, dt_match);