OCL: Added performance test for additional modes of cvtColor  

Merge with extra: Itseez/opencv_extra#224 
New testing modes: YUV2RGB_IYUV, YUV2GRAY_420, RGB2YUV_IYUV, YUV2RGB_YUY2, YUV2GRAY_YUY2.

check_regression=*OCL*Color*
test_modules=imgproc
build_examples=OFF