vpx_mem: remove vpx_memmove

vestigial. replace instances with memmove() which they already were
being defined to.

Change-Id: If396d3f9e3cf79c0ee5d7429615ef3d6b2a34afa

vp8/encoder/bitstream.c

@@ -1620,7 +1620,7 @@ void vp8_pack_bitstream(VP8_COMP *cpi, unsigned char *dest, unsigned char * dest
             /* concatenate partition buffers */
             for(i = 0; i < num_part; i++)
             {
-                vpx_memmove(dp, cpi->partition_d[i+1], cpi->partition_sz[i+1]);
+                memmove(dp, cpi->partition_d[i+1], cpi->partition_sz[i+1]);
                 cpi->partition_d[i+1] = dp;
                 dp += cpi->partition_sz[i+1];
             }

vp9/encoder/vp9_rdopt.c

@@ -1321,8 +1321,7 @@ static int set_and_cost_bmi_mvs(VP9_COMP *cpi, MACROBLOCKD *xd, int i,
 
   for (idy = 0; idy < num_4x4_blocks_high; ++idy)
     for (idx = 0; idx < num_4x4_blocks_wide; ++idx)
-      vpx_memmove(&mic->bmi[i + idy * 2 + idx],
-                  &mic->bmi[i], sizeof(mic->bmi[i]));
+      memmove(&mic->bmi[i + idy * 2 + idx], &mic->bmi[i], sizeof(mic->bmi[i]));
 
   return cost_mv_ref(cpi, mode, mbmi->mode_context[mbmi->ref_frame[0]]) +
             thismvcost;

vpx_mem/vpx_mem.c

@@ -109,7 +109,3 @@ void *vpx_memset16(void *dest, int val, size_t length) {
   return orig;
 }
 #endif  // CONFIG_VP9 && CONFIG_VP9_HIGHBITDEPTH
-
-void *vpx_memmove(void *dest, const void *src, size_t count) {
-  return memmove(dest, src, count);
-}

vpx_mem/vpx_mem.h

@@ -35,13 +35,11 @@ extern "C" {
 #if CONFIG_VP9 && CONFIG_VP9_HIGHBITDEPTH
   void *vpx_memset16(void *dest, int val, size_t length);
 #endif
-  void *vpx_memmove(void *dest, const void *src, size_t count);
 
 #ifndef __VPX_MEM_C__
 # include <string.h>
 # define vpx_memcpy  memcpy
 # define vpx_memset  memset
-# define vpx_memmove memmove
 #endif
 
 #ifdef VPX_MEM_PLTFRM