disp: msm: dp: fix to handle host ready failues

Handle host_ready failures and try to initialize host if not already.
Sometimes customizations for customers causes NOC error as host_ready
doesn't return early upon failure and the customer customization
tries to access aux register to reconfig upon aux failure while
reading EDID. Adding fix will make driver more robust to handle such
cases.

Change-Id: Ifa5c56daa32c4ef366a0e05718495ffcb40b96b3
Signed-off-by: Rajat Gupta <rajatgu@codeaurora.org>