drm/msm/hdmi: disable HDR state on bridge disable

HDR info frames were not disabled after a hotplug and app closure
or in the event of an unexpected termination of the userspace driver.
Fixed the issue by resetting to HDR_DISABLE state in hdmi bridge disable.

Change-Id: Iead5cfe11512a8c49b6a2183561de427ce16f393
Signed-off-by: Navid Bahrani <nbahrani@codeaurora.org>