msm: mdss: hdmi: fix scrambling interrupt handling

Use proper timeout values for polling scrambling status from sink.
Clear the interrupts and stop polling after timeout if scrambling
status is not updated by sink indicating it has not detected
scrambling signal.

Change-Id: I3cac01ef261ee958fd0bbecf88edde5305b20ee7
Signed-off-by: Ajay Singh Parmar <aparmar@codeaurora.org>