Add enums for 10bit color formats

To improve wide-color behavior it's useful to have more bits
per color component. This defines 10:10:10:2 and 10:10:10:X
for that use.
This can be used for any color space / dataspace that is
compatible with unsigned integer components, e.g. Display-P3,
BT2020, etc.
Test: TBD
Bug: 29940137

Change-Id: Ieb8757e76b1d5bc45ce37c2473289eed7db66139
diff --git a/include/system/graphics-base.h b/include/system/graphics-base.h
index 32b077a..4df7fe7 100644
--- a/include/system/graphics-base.h
+++ b/include/system/graphics-base.h
@@ -14,6 +14,7 @@
     HAL_PIXEL_FORMAT_RGB_888 = 3,
     HAL_PIXEL_FORMAT_RGB_565 = 4,
     HAL_PIXEL_FORMAT_BGRA_8888 = 5,
+    HAL_PIXEL_FORMAT_RGBA_1010102 = 43, // 0x2B
     HAL_PIXEL_FORMAT_RGBA_FP16 = 22, // 0x16
     HAL_PIXEL_FORMAT_YV12 = 842094169, // 0x32315659
     HAL_PIXEL_FORMAT_Y8 = 538982489, // 0x20203859