msm_shared: mdp: fix incorrect flush programming

If continuous splash is enabled, incorrect flush programming in lk
can have adverse effects when kernel boots up. Current flush programming
is writing BIT(16) which is for write-back interface and incorrect.
Fix this and add correct flush bit for DSPP1.

Change-Id: Ifb9c148cf9d7702f2289eb8d9e127e21773d22a2
1 file changed