msm: mdss: fix watchdog bite due to ping-pong timeout log flooding

Most likely root cause of ping-pong timeouts is a pipeline hang in the
display controller. These pipeline hangs can happen due to bad frame
configuration and if this bad configuration persists every frame then
ping-pong timeouts will flood the console with warning logs and may lead
to watchdog bite. Fix this by reporting ping-pong timeout only once every
bad configuration.

Change-Id: I1dc7a729f10e70e2bed947dd72713c0adfe96942
Signed-off-by: Ujwal Patel <ujwalp@codeaurora.org>