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sub pixel variance neon: use generic variance

When a neon version is available it will be called. This allows
decoupling the variance implementations and has no real downside. For
most configurations, the call will be #define'd to the neon
implementation.

Change-Id: Ibb2afe4e156c5610e89488504d366b3e6d1ba712

--- a/vpx_dsp/arm/subpel_variance_neon.c

+++ b/vpx_dsp/arm/subpel_variance_neon.c

@@ -22,6 +22,7 @@

   { 64, 64 }, { 48, 80 },  { 32, 96 }, { 16, 112 },

 };

+// Process a block exactly 8 wide and any height.

 static void var_filter_block2d_bil_w8(const uint8_t *src_ptr,

                                       uint8_t *output_ptr,

                                       unsigned int src_pixels_per_line,

@@ -45,6 +46,7 @@

   }

 }

+// Process a block which is a mutiple of 16 wide and any height.

 static void var_filter_block2d_bil_w16(const uint8_t *src_ptr,

                                        uint8_t *output_ptr,

                                        unsigned int src_pixels_per_line,

@@ -99,7 +101,7 @@

                              bilinear_filters[xoffset]);

   var_filter_block2d_bil_w16(fdata3, temp2, 16, 16, 16, 16,

                              bilinear_filters[yoffset]);

-  return vpx_variance16x16_neon(temp2, 16, dst, dst_stride, sse);

+  return vpx_variance16x16(temp2, 16, dst, dst_stride, sse);

 }

 unsigned int vpx_sub_pixel_variance32x32_neon(const uint8_t *src,

@@ -114,7 +116,7 @@

                              bilinear_filters[xoffset]);

   var_filter_block2d_bil_w16(fdata3, temp2, 32, 32, 32, 32,

                              bilinear_filters[yoffset]);

-  return vpx_variance32x32_neon(temp2, 32, dst, dst_stride, sse);

+  return vpx_variance32x32(temp2, 32, dst, dst_stride, sse);

 }

 unsigned int vpx_sub_pixel_variance64x64_neon(const uint8_t *src,

@@ -129,5 +131,5 @@

                              bilinear_filters[xoffset]);

   var_filter_block2d_bil_w16(fdata3, temp2, 64, 64, 64, 64,

                              bilinear_filters[yoffset]);

-  return vpx_variance64x64_neon(temp2, 64, dst, dst_stride, sse);

+  return vpx_variance64x64(temp2, 64, dst, dst_stride, sse);

 }