drm/bridge: lt9611uxc: add hpd support for lt9611uxc
When HDMI cable was pluged in/out, it could trigger an irq,
MSM can get HPD status from LT9611, and report the HPD status
using kernel uevent to userspace.
Change-Id: I47c148d92e877a80147ee81498513ead0e4afcf0
Signed-off-by:
Wenjun Zhang <wjzhan@codeaurora.org>
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