dsp.h: remove utils.h include

include utils.h directly where needed to allow utils.h to rely on
defines from dsp.h in a follow-up.

Change-Id: I32e26aaeb0b04ba60b3332f685f9a2be5a0a8d3d

src/dsp/dec_sse41.c

@@ -17,6 +17,7 @@
 
 #include <smmintrin.h>
 #include "../dec/vp8i.h"
+#include "../utils/utils.h"
 
 static void HE16(uint8_t* dst) {     // horizontal
   int j;