Correct the declaration of hipBindTexture()

The texture reference needs to be passed as a constant pointer.

Change-Id: I36ca0bddaba30becfc2ce70dd9e5b7db66c57f27

vdi/hip_texture.cpp

@@ -607,7 +607,7 @@ hipError_t hipUnbindTexture(const textureReference* texref) {
 }
 
 hipError_t hipBindTexture(size_t* offset,
-                          textureReference* texref,
+                          const textureReference* texref,
                           const void* devPtr,
                           const hipChannelFormatDesc* desc,
                           size_t size) {