msm_fb: HDMI: Removing unnecessary HPD detection code.

HPD read work is used to detect HPD at bootup which
is not required as HPD detection is taken care at
bootup by toggling the HPD circuit. So we can safely
remove this redundant code.

CRs-Fixed: 368865
Change-Id: I8eed00c4f5af2ed2ca37e86da622ab518e5eb887
Signed-off-by: Aravind Venkateswaran <aravindh@codeaurora.org>
Signed-off-by: Ajay Singh Parmar <aparmar@codeaurora.org>