image2yuvconfig() should calculate uv_crop_width

image2yuvconfig() should calculate uv_crop_width and uv_crop_height from
y_crop_width and y_crop_height.

Use the same formula to calculate uv_width and uv_height.

BUG=aomedia:3115

Change-Id: I12d31f4fb0133e8e54809ae0c92bf07c14aa1edf
(cherry picked from commit 0607f6bef891c005bbec7a6a23479e111a7048b5)

av1/av1_iface_common.h

diff --git a/av1/av1_iface_common.h b/av1/av1_iface_common.h
index 9b5ffcb..f5775d3 100644
--- a/av1/av1_iface_common.h
+++ b/av1/av1_iface_common.h
@@ -93,12 +93,13 @@
   yv12->y_width = img->w;
   yv12->y_height = img->h;
 
-  yv12->uv_width =
-      img->x_chroma_shift == 1 ? (1 + yv12->y_width) / 2 : yv12->y_width;
+  yv12->uv_width = (yv12->y_width + img->x_chroma_shift) >> img->x_chroma_shift;
   yv12->uv_height =
-      img->y_chroma_shift == 1 ? (1 + yv12->y_height) / 2 : yv12->y_height;
-  yv12->uv_crop_width = yv12->uv_width;
-  yv12->uv_crop_height = yv12->uv_height;
+      (yv12->y_height + img->y_chroma_shift) >> img->y_chroma_shift;
+  yv12->uv_crop_width =
+      (yv12->y_crop_width + img->x_chroma_shift) >> img->x_chroma_shift;
+  yv12->uv_crop_height =
+      (yv12->y_crop_height + img->y_chroma_shift) >> img->y_chroma_shift;
 
   yv12->y_stride = img->stride[AOM_PLANE_Y];
   yv12->uv_stride = img->stride[AOM_PLANE_U];