Change vp9_ prefix function names in vpx_scale to vpx_

Change-Id: Iac85902cbbb3e752801dc85de9a3c778e47304aa

vp9/decoder/vp9_decodeframe.c

diff --git a/vp9/decoder/vp9_decodeframe.c b/vp9/decoder/vp9_decodeframe.c
index 58b79ea..fb7b3b8 100644
--- a/vp9/decoder/vp9_decodeframe.c
+++ b/vp9/decoder/vp9_decodeframe.c
@@ -1235,7 +1235,7 @@
   setup_display_size(cm, rb);
 
   lock_buffer_pool(pool);
-  if (vp9_realloc_frame_buffer(
+  if (vpx_realloc_frame_buffer(
           get_frame_new_buffer(cm), cm->width, cm->height,
           cm->subsampling_x, cm->subsampling_y,
 #if CONFIG_VP9_HIGHBITDEPTH
@@ -1316,7 +1316,7 @@
   setup_display_size(cm, rb);
 
   lock_buffer_pool(pool);
-  if (vp9_realloc_frame_buffer(
+  if (vpx_realloc_frame_buffer(
           get_frame_new_buffer(cm), cm->width, cm->height,
           cm->subsampling_x, cm->subsampling_y,
 #if CONFIG_VP9_HIGHBITDEPTH