hwc: Add support for RGBA_4444 and RGBA_5551 formats

1. Modify gralloc library to allocate buffers for RGBA_4444 and
   RGBA_5551 formats
2. Modify copybit library to add composition support for RGBA_4444
   and RGBA_5551 layers
3. Modify hwc library to add MDP composition and rotator support for
   RGBA_4444 and RGBA_5551 layers.

Change-Id: I30dbc4e5e2c010835fa7e7663f996f67779a1803
diff --git a/liboverlay/overlayUtils.cpp b/liboverlay/overlayUtils.cpp
index cbd52ae..32b2013 100644
--- a/liboverlay/overlayUtils.cpp
+++ b/liboverlay/overlayUtils.cpp
@@ -93,6 +93,10 @@
             return MDP_RGB_888;
         case HAL_PIXEL_FORMAT_RGB_565:
             return MDP_RGB_565;
+        case HAL_PIXEL_FORMAT_RGBA_5551:
+            return MDP_RGBA_5551;
+        case HAL_PIXEL_FORMAT_RGBA_4444:
+            return MDP_RGBA_4444;
         case HAL_PIXEL_FORMAT_BGRA_8888:
             return MDP_BGRA_8888;
         case HAL_PIXEL_FORMAT_BGRX_8888:
@@ -126,9 +130,6 @@
             return MDP_Y_CBCR_H2V2_VENUS;
         default:
             //Unsupported by MDP
-            //---graphics.h--------
-            //HAL_PIXEL_FORMAT_RGBA_5551
-            //HAL_PIXEL_FORMAT_RGBA_4444
             //---gralloc_priv.h-----
             //HAL_PIXEL_FORMAT_YCrCb_420_SP_ADRENO    = 0x7FA30C01
             //HAL_PIXEL_FORMAT_R_8                    = 0x10D
@@ -180,6 +181,10 @@
             return HAL_PIXEL_FORMAT_RGB_888;
         case MDP_RGB_565:
             return HAL_PIXEL_FORMAT_RGB_565;
+        case MDP_RGBA_5551:
+            return HAL_PIXEL_FORMAT_RGBA_5551;
+        case MDP_RGBA_4444:
+            return HAL_PIXEL_FORMAT_RGBA_4444;
         case MDP_BGRA_8888:
             return HAL_PIXEL_FORMAT_BGRA_8888;
         case MDP_Y_CR_CB_GH2V2: