Don't dither RGB 565 frames

The GPU does not dither so in order to be compatible neither should
HWComposer

Change-Id: I6f64072e89d0ed0d1c28b648efe0ac780a746dac

hwc-dont-dither-rgb565.patch

+diff --git a/libhwcomposer/a-family/hwcomposer.cpp b/libhwcomposer/a-family/hwcomposer.cpp
+index 6072f9d..50d1e55 100644
+--- a/libhwcomposer/a-family/hwcomposer.cpp
++++ b/libhwcomposer/a-family/hwcomposer.cpp
+@@ -1700,8 +1700,7 @@ static int drawLayerUsingCopybit(hwc_composer_device_t *dev, hwc_layer_t *layer,
+     copybit->set_parameter(copybit, COPYBIT_PLANE_ALPHA, 255);
+     copybit->set_parameter(copybit, COPYBIT_PREMULTIPLIED_ALPHA,
+                            (layer->blending == HWC_BLENDING_PREMULT)? COPYBIT_ENABLE : COPYBIT_DISABLE);
+-    copybit->set_parameter(copybit, COPYBIT_DITHER,
+-                            (dst.format == HAL_PIXEL_FORMAT_RGB_565)? COPYBIT_ENABLE : COPYBIT_DISABLE);
++    copybit->set_parameter(copybit, COPYBIT_DITHER, COPYBIT_DISABLE);
+     err = copybit->stretch(copybit, &dst, &src, &dstRect, &srcRect, &copybitRegion);
+ 
+     if(tmpHnd)