drm/msm/sde: add watchdog timer support to generate vsync

This change uses watchdog timer_0 to generate
the vsync signal for command mode panel.

Change-Id: Ia53fd6278a8fafc699f0320a5655cf8695b7b76b
Signed-off-by: Narendra Muppalla <NarendraM@codeaurora.org>
8 files changed