msm_fb: hdmi: Proper HPD state update

On switching off the HPD, we need to update the HPD state
after the polarity has been done to set the HPD state in
hardware properly.

CRs-Fixed: 465476
Change-Id: Ic0ba7fac72b8188c86a034ba9a45107689809028
Signed-off-by: Ajay Singh Parmar <aparmar@codeaurora.org>