msm: mdss: hdmi: do not timeout on hdcp re-authentication

Keep re-authenticating until successful as sinks may choose
not to issue HPD while switching HDMI ports or powering on/off
which usually trigger HDCP on/off.

Change-Id: Ib4b13592df8753df1693c6279f04fc963ba9974f
Signed-off-by: Ajay Singh Parmar <aparmar@codeaurora.org>