Use int16_t for warp parameters

This is to fix compiling issues with aom-highbitdepth.

Change-Id: I66ee73e014a028536747e55209f20be81e906267

av1/common/x86/highbd_warp_plane_ssse3.c

@@ -22,8 +22,8 @@ void av1_highbd_warp_affine_ssse3(int32_t *mat, uint16_t *ref, int width,
                                   int p_col, int p_row, int p_width,
                                   int p_height, int p_stride, int subsampling_x,
                                   int subsampling_y, int bd, int ref_frm,
-                                  int32_t alpha, int32_t beta, int32_t gamma,
+                                  int16_t alpha, int16_t beta, int16_t gamma,
-                                  int32_t delta) {
+                                  int16_t delta) {
 #if HORSHEAR_REDUCE_PREC_BITS >= 5
   __m128i tmp[15];
 #else