Color Format and Overlay Functions

Add hardware overlay related function declarations and more color format enums
diff --git a/include/hardware/hardware.h b/include/hardware/hardware.h
index c8dc6f6..27a4156 100644
--- a/include/hardware/hardware.h
+++ b/include/hardware/hardware.h
@@ -130,7 +130,9 @@
     HAL_PIXEL_FORMAT_YCbCr_422_P  = 0x12,
     HAL_PIXEL_FORMAT_YCbCr_420_P  = 0x13,
     HAL_PIXEL_FORMAT_YCbCr_422_I  = 0x14,
-    HAL_PIXEL_FORMAT_YCbCr_420_I  = 0x15
+    HAL_PIXEL_FORMAT_YCbCr_420_I  = 0x15,
+    HAL_PIXEL_FORMAT_CbYCrY_422_I = 0x16,
+    HAL_PIXEL_FORMAT_CbYCrY_420_I = 0x17
 };