Detect MIPS DSP and DSPR2 programattically.

src/core/SkBlitter_RGB16.cpp

Index: src/core/SkBlitter_RGB16.cpp
diff --git a/src/core/SkBlitter_RGB16.cpp b/src/core/SkBlitter_RGB16.cpp
index 8caf90831231fdcc61cd6c166e193a9eab1ee281..d87c63659036efb2862d699b4e392ad5b3796b05 100644
--- a/src/core/SkBlitter_RGB16.cpp
+++ b/src/core/SkBlitter_RGB16.cpp
@@ -14,7 +14,7 @@
 #include "SkUtilsArm.h"
 #include "SkXfermode.h"
 
-#if SK_MIPS_HAS_DSP
+#if defined(__mips_dsp)
 extern void blitmask_d565_opaque_mips(int width, int height, uint16_t* device,
                                       unsigned deviceRB, const uint8_t* alpha,
                                       uint32_t expanded32, unsigned maskRB);
@@ -374,7 +374,7 @@ void SkRGB16_Opaque_Blitter::blitAntiH(int x, int y,
 #define SK_BLITBWMASK_DEVTYPE               uint16_t
 #include "SkBlitBWMaskTemplate.h"
 
-#if !defined(SK_MIPS_HAS_DSP)
+#if !defined(__mips_dsp)
 static U16CPU blend_compact(uint32_t src32, uint32_t dst32, unsigned scale5) {
     return SkCompact_rgb_16(dst32 + ((src32 - dst32) * scale5 >> 5));
 }
@@ -465,7 +465,7 @@ void SkRGB16_Opaque_Blitter::blitMask(const SkMask& mask,
         alpha += maskRB;
     } while (--height != 0);
 #undef    UNROLL
-#elif SK_MIPS_HAS_DSP
+#elif defined(__mips_dsp)
     blitmask_d565_opaque_mips(width, height, device, deviceRB, alpha, expanded32, maskRB);
 #else   // non-neon code
     do {