Include RTCD header in encodeframe.c

The file uses functions defined in vp8_rtcd.h but did not include the
header.

Change-Id: I110196ddc9181e533be1fe656e21c1791cabe226

vp8/encoder/encodeframe.c

@@ -10,6 +10,7 @@
 
 
 #include "vpx_config.h"
+#include "vp8_rtcd.h"
 #include "encodemb.h"
 #include "encodemv.h"
 #include "vp8/common/common.h"