gralloc: Add support for Y16 and Y8 color formats

Add support for buffer allocation with y16 and Y8
color formats.

Change-Id: If167e32c82fa1c89f205b191e8a118acff923c0b
CRs-Fixed: 2048886
diff --git a/libgralloc1/gr_buf_mgr.cpp b/libgralloc1/gr_buf_mgr.cpp
index 4c3f7d4..8422622 100644
--- a/libgralloc1/gr_buf_mgr.cpp
+++ b/libgralloc1/gr_buf_mgr.cpp
@@ -782,9 +782,11 @@
     case HAL_PIXEL_FORMAT_YCrCb_420_SP_ADRENO:
     case HAL_PIXEL_FORMAT_NV21_ZSL:
     case HAL_PIXEL_FORMAT_RAW16:
+    case HAL_PIXEL_FORMAT_Y16:
     case HAL_PIXEL_FORMAT_RAW12:
     case HAL_PIXEL_FORMAT_RAW10:
     case HAL_PIXEL_FORMAT_YV12:
+    case HAL_PIXEL_FORMAT_Y8:
       return true;
     default:
       return false;