msm: mdss: Remove redundant handoff pending check

In overlay start, currently there is a check that if
splash handoff is pending then fail the overlay start
for that particular fb. Remove this check as this is
not required anymore. HAL should take care that it
calls fb open (for HDMI) only after splash cleanup is
done.

Change-Id: Ie20bd778ba8df2bd54c3804870ad4e8bb45702b8
Signed-off-by: Jayant Shekhar <jshekhar@codeaurora.org>