[Graphics] Only validate display in PresentOrValidateDisplay.

Previously we require display to be validated in onRefresh, however, onRefresh
can be called while validateDisplay is executing, results in next
presentDisplay being skipped. This patch makes sure we don't check validation
state when presentDisplay is called.

BUG: 80063800
Test: build, flash, boot and play Youtube videos.
Change-Id: I3d8686db3274436afb6605812641768296f1af0e