msm: mdss: Support GCDB on 8x10 target.

Update dsi v2 driver to use GCDB platform
tags and B family panel utility API. This changes
supports complete GCDB kernel dtsi tags
for 8x10. It also removes the panel v2 driver because
switching to B family panel utility removes
panel v2 driver usage.

Change-Id: I840223279ef3aa6aa8ee364f6c4e03f49e0e2d4b
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>