msm: mdp3: reprogram CSC configuration after underrun interrupt

Underrun would cause resetting of CSC registers thereby causing
black screen. Now schedule work to program CSC registers in
underrun interrupt handler.

Change-Id: I9f5cc8ddbe9afbfd36d65601b66e8da5e7ec6e95
Signed-off-by: Krishna Chaitanya Parimi <cparimi@codeaurora.org>