Temporarily revert some 4:2:2 code

As part of 9cf0c9cde7698754c0e07768f9290b5ff3c13341 the buffering was made
to better handle 4:2:2, but that causes regressions in the tests, so we're
backing out part of it for now.

Change-Id: I9ca4cfeb159aa65514613989e3dcbc30f86ec5b2

av1/common/cdef.c

diff --git a/av1/common/cdef.c b/av1/common/cdef.c
index 1ac7385..13d96b1 100644
--- a/av1/common/cdef.c
+++ b/av1/common/cdef.c
@@ -203,7 +203,9 @@
   for (pli = 0; pli < nplanes; pli++) {
     dec[pli] = xd->plane[pli].subsampling_x;
     mi_wide_l2[pli] = MI_SIZE_LOG2 - xd->plane[pli].subsampling_x;
-    mi_high_l2[pli] = MI_SIZE_LOG2 - xd->plane[pli].subsampling_y;
+    // TODO(stemidts/jmvalin): We should use subsampling_y below but can't
+    // until we've properly fixed 4:2:2
+    mi_high_l2[pli] = MI_SIZE_LOG2 - xd->plane[pli].subsampling_x;
   }
   stride = (cm->mi_cols << MI_SIZE_LOG2) + 2 * OD_FILT_HBORDER;
   for (pli = 0; pli < nplanes; pli++) {