display: Add color space metadata field

Add color space field in gralloc buffer metadata
for buffer producer to propogate color space
information to consumer.

This approach is more flexible in the sense
that gralloc doesn't need to depend on usage
flag to derive color space.

Change-Id: I89d5a85f84a6f36dca7c5fc754dc7eb19581169a
diff --git a/libqdutils/qdMetaData.cpp b/libqdutils/qdMetaData.cpp
index ecbf873..9920513 100644
--- a/libqdutils/qdMetaData.cpp
+++ b/libqdutils/qdMetaData.cpp
@@ -103,6 +103,9 @@
             }
         }
         break;
+        case UPDATE_COLOR_SPACE:
+            data->colorSpace = *((ColorSpace_t *)param);
+            break;
         default:
             ALOGE("Unknown paramType %d", paramType);
             break;