Mking color conversion use simple arrays within structure, which will be referenced via register pointer.

R=harryjin@google.com
BUG=libyuv:616
TEST=CC=gcc-4.4 CXX=g++-4.4 LD=ld-4.4 make -f linux.mk

Review URL: https://codereview.chromium.org/2127863003 .