Fix RGB565ToARGB_SSE2. Expose rgb conversions.  Low levels were already there for i420 to rgb, but rgb to rgb functions were not exposed.  Added unittests.
BUG=none
TEST=planar unittests
Review URL: https://webrtc-codereview.appspot.com/632004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@276 16f28f9a-4ce2-e073-06de-1de4eb20be90
diff --git a/source/row_posix.cc b/source/row_posix.cc
index 1e61e1f..a51207d 100644
--- a/source/row_posix.cc
+++ b/source/row_posix.cc
@@ -272,7 +272,7 @@
     "mov       $0x1080108,%%eax                \n"
     "movd      %%eax,%%xmm5                    \n"
     "pshufd    $0x0,%%xmm5,%%xmm5              \n"
-    "mov       $0x20082008,%%eax               \n"
+    "mov       $0x20802080,%%eax               \n"
     "movd      %%eax,%%xmm6                    \n"
     "pshufd    $0x0,%%xmm6,%%xmm6              \n"
     "pcmpeqb   %%xmm3,%%xmm3                   \n"