Port convolve functions to SkOpts

src/opts/SkBitmapProcState_opts_mips_dsp.cpp

 /*
  * Copyright 2014 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "SkBitmapProcState.h"
 #include "SkBitmapScaler.h"
@@ skipping 239 matching lines @@
                 if (isOpaque) {
                     fSampleProc32 = SI8_opaque_D32_nofilter_DX_mips_dsp;
                     fShaderProc32 = nullptr;
                 }
             }
             break;
         default:
             break;
     }
 }
-
-void SkBitmapScaler::PlatformConvolutionProcs(SkConvolutionProcs*) {}