MLK-18877-1 drm/bridge: adv7511: Add debug info for HPD event

commit 2316564c657e5e1c9b697c967b3c38b7b98ca57f from
https://github.com/nxp-imx/linux-imx



Add debug information for the HDP event catched with i2c interrupt.
Also, simplify the code in adv7511_hpd_work.

Signed-off-by: Robert Chiras <robert.chiras@nxp.com>
Signed-off-by: Xiaolei Wang <xiaolei.wang@windriver.com>