Get accurate obmc count

Fixed an issue to get accurate obmc count.

Saw minor(0.01% - 0.02%) quality improvement, and no speed
change.

STATS_CHANGED

Change-Id: I2ea9d8f95ca0352e5c6de895f9bbdee1edacdfbe

av1/encoder/encodeframe.c

diff --git a/av1/encoder/encodeframe.c b/av1/encoder/encodeframe.c
index cd7f51a..a1a5c48 100644
--- a/av1/encoder/encodeframe.c
+++ b/av1/encoder/encodeframe.c
@@ -1652,7 +1652,7 @@
                                       cm->allow_warped_motion)
                 : SIMPLE_TRANSLATION;
         if (mbmi->ref_frame[1] != INTRA_FRAME &&
-            motion_allowed == OBMC_CAUSAL) {
+            motion_allowed >= OBMC_CAUSAL) {
           td->rd_counts.obmc_used[bsize][mbmi->motion_mode == OBMC_CAUSAL]++;
         }
       }