hwc: Color layer always has zero transform.

Color layer always has zero transform because framework uses the
transform member of hwc layer to pass the color value to HAL.

Change-Id: I79fe204c558d1b6e1dd69ba635ba0bd87140b1b1
diff --git a/libhwcomposer/hwc_copybit.cpp b/libhwcomposer/hwc_copybit.cpp
index 3a4bada..b111661 100644
--- a/libhwcomposer/hwc_copybit.cpp
+++ b/libhwcomposer/hwc_copybit.cpp
@@ -177,7 +177,7 @@
                 return true;
             hwc_rect_t sourceCrop = integerizeSourceCrop(layer->sourceCropf);
 
-            if (layer->transform & HAL_TRANSFORM_ROT_90) {
+            if (has90Transform(layer)) {
                 src_h = sourceCrop.right - sourceCrop.left;
                 src_w = sourceCrop.bottom - sourceCrop.top;
             } else {