drm: drm_fourcc: add Samsung 16x16 tile format

Add modifier for tiled formats used by graphics modules found in Samsung
Exynos5250/542x/5433 SoCs. This is a simple tiled layout using tiles
of 16x16 pixels in a row-major layout.
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

include/uapi/drm/drm_fourcc.h

@@ -338,6 +338,15 @@ extern "C" {
  */
 #define DRM_FORMAT_MOD_SAMSUNG_64_32_TILE	fourcc_mod_code(SAMSUNG, 1)
 
+/*
+ * Tiled, 16 (pixels) x 16 (lines) - sized macroblocks
+ *
+ * This is a simple tiled layout using tiles of 16x16 pixels in a row-major
+ * layout. For YCbCr formats Cb/Cr components are taken in such a way that
+ * they correspond to their 16x16 luma block.
+ */
+#define DRM_FORMAT_MOD_SAMSUNG_16_16_TILE	fourcc_mod_code(SAMSUNG, 2)
+
 /*
  * Qualcomm Compressed Format
  *