Clean up naming of VP9 support functions.

Change-Id: Ibfa931f3fb3a2ed2649733b7d7e679c0091dda90
diff --git a/scriptc/rs_walsh.rsh b/scriptc/rs_walsh.rsh
index de058ce..6f7445d 100644
--- a/scriptc/rs_walsh.rsh
+++ b/scriptc/rs_walsh.rsh
@@ -3,8 +3,8 @@
 
 #if RS_VERSION > 19
 
-extern void walsh4x4(rs_allocation input, rs_allocation dest, int xoff, int yoff);
-extern void walsh4x4_1(rs_allocation input, rs_allocation dest, int xoff, int yoff);
+extern void rsWalsh4x4(rs_allocation input, rs_allocation dest, int xoff, int yoff);
+extern void rsWalsh4x4_1(rs_allocation input, rs_allocation dest, int xoff, int yoff);
 
 #endif