FIXUP: drm/bridge: analogix_dp: misc update to upstream version

FIXUP: drm/bridge: analogix_dp: misc update to upstream version

This misc update would try to fix below comments from my eDP thread[0],
and lucky to say this version is stable, and i'm start to perpare the
pull request to David with this version. So i guess it's time to create
a misc FIXUP patch to address the comments.

[0]: https://patchwork.kernel.org/patch/9175613/

- Correct the misspell of "marcos" in commit message (Dominik, reviewed at Google Gerrit)
- Write a kerneldoc-style comment explaining the chips data fields (Tomasz, reviewed at Google Gerrit)
- Drop the '.lcdcsel_mask' number in chips data field (Tomasz, reviewed at Google Gerrit)
- Make this hack code more clear (Tomasz, reviewed at Google Gerrit)
  reg = ~reg & REF_CLK_MASK;  --->  reg ^= REF_CLK_MASK;
- Give the "rk3399-edp" a separate line for clarity in document (Tomasz, reviewed at Google Gerrit)
- Move 'output_type' setting before the return statement (Tomasz, reviewed at Google Gerrit)
- Avoid to change any internal driver state in .mode_valid interface. (Tomasz, reviewed at Google Gerrit)
- Hook the connector's color_formats in .get_modes directly. (Tomasz, reviewed at Google Gerrit)

Change-Id: Ic35f166ebac04e417ff3d135e7bf4573bbca2004
Signed-off-by: Yakir Yang <ykk@rock-chips.com>