drm/msm: reset sink hdr capabilities during bridge disable

Reset the HDR capabilities during the bridge disable.
The capabilities are re-programmed the next time
the userspace issues the call to populate the modes.

Change-Id: I04dbaa99c291de13b81e12cb9742cc97d9b02593
Signed-off-by: Abhinav Kumar <abhinavk@codeaurora.org>