Extend CLPF to chroma.

Objective quality impact (low latency):

PSNR YCbCr:      0.13%     -1.37%     -1.79%
   PSNRHVS:      0.03%
      SSIM:      0.24%
    MSSSIM:      0.10%
 CIEDE2000:     -0.83%

Change-Id: I8ddf0def569286775f0f9d4d4005932766a7fc27