msm: display_legacy: Fixed inconsistent cache issue for MIPI
msm: display_legacy: Fixed inconsistent cache issue for MIPI

Add invalidate cache function to flush cache to DDR, when
LK memory is configured as write back.

Change-Id: I855956617e611ed96af8bf2663619a510cd07e78

efidroid/lk,efidroid/lk,efidroid/lk,efidroid/lk,efidroid/lk