msm: mdss: hdmi: update switch node on hpd off

During framework reboot, keep the switch nodes in sync with
user modules to make sure hdmi cable notification mechanism
works after reboot.

Change-Id: I22696b17ec6ff11b1a378df9611eb8ab4be01358
Signed-off-by: Ajay Singh Parmar <aparmar@codeaurora.org>