fixed function prototype

so they are consistent with actual definitions of the functions

Change-Id: Ie4b4e81b3da3e288fc2edbbd2b393a5c54d2556b

vp9/common/rtcd_defs.sh

@@ -376,22 +376,22 @@ specialize vp9_sad8x8x8 sse4
 prototype void vp9_sad4x4x8 "const unsigned char *src_ptr, int  src_stride, const unsigned char *ref_ptr, int  ref_stride, unsigned short *sad_array"
 specialize vp9_sad4x4x8 sse4
 
-prototype void vp9_sad32x32x4d "const unsigned char *src_ptr, int  src_stride, unsigned char *ref_ptr[], int  ref_stride, unsigned int *sad_array"
+prototype void vp9_sad32x32x4d "const unsigned char *src_ptr, int  src_stride, const unsigned char* const ref_ptr[], int  ref_stride, unsigned int *sad_array"
 specialize vp9_sad32x32x4d
 
-prototype void vp9_sad16x16x4d "const unsigned char *src_ptr, int  src_stride, unsigned char *ref_ptr[], int  ref_stride, unsigned int *sad_array"
+prototype void vp9_sad16x16x4d "const unsigned char *src_ptr, int  src_stride, const unsigned char* const ref_ptr[], int  ref_stride, unsigned int *sad_array"
 specialize vp9_sad16x16x4d sse3
 
-prototype void vp9_sad16x8x4d "const unsigned char *src_ptr, int  src_stride, unsigned char *ref_ptr[], int  ref_stride, unsigned int *sad_array"
+prototype void vp9_sad16x8x4d "const unsigned char *src_ptr, int  src_stride, const unsigned char* const ref_ptr[], int  ref_stride, unsigned int *sad_array"
 specialize vp9_sad16x8x4d sse3
 
-prototype void vp9_sad8x16x4d "const unsigned char *src_ptr, int  src_stride, unsigned char *ref_ptr[], int  ref_stride, unsigned int *sad_array"
+prototype void vp9_sad8x16x4d "const unsigned char *src_ptr, int  src_stride, const unsigned char* const ref_ptr[], int  ref_stride, unsigned int *sad_array"
 specialize vp9_sad8x16x4d sse3
 
-prototype void vp9_sad8x8x4d "const unsigned char *src_ptr, int  src_stride, unsigned char *ref_ptr[], int  ref_stride, unsigned int *sad_array"
+prototype void vp9_sad8x8x4d "const unsigned char *src_ptr, int  src_stride, const unsigned char* const ref_ptr[], int  ref_stride, unsigned int *sad_array"
 specialize vp9_sad8x8x4d sse3
 
-prototype void vp9_sad4x4x4d "const unsigned char *src_ptr, int  src_stride, unsigned char *ref_ptr[], int  ref_stride, unsigned int *sad_array"
+prototype void vp9_sad4x4x4d "const unsigned char *src_ptr, int  src_stride, const unsigned char* const ref_ptr[], int  ref_stride, unsigned int *sad_array"
 specialize vp9_sad4x4x4d sse3
 
 #