drm/msm/sde: disable dither for 10bit dsc panel

Current MDSS driver enables dither for all cases
except when DSI color component is 10bits. This is
wrong assumption for 10 bit panel with 3.75 dsc
compression ratio. Such invalid configuration
may cause image quality issue. Avoid enabling dither
in these cases by checking bits per component or
bits per pixel.

Change-Id: I5dabb035fbe59769015136d4ba112af185168810
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>