Revert "msm: mdss: enable vsync event during continuous splash"

This reverts commit ee316615d4969472511f768e021be1830b6456f7.
Revert "msm: mdss: Fix watermark level calculations for pipe updates"

This reverts commit 8fec20a3f3950d5e8e92499b7a9fc629fa42e1ee.
Revert "msm: mdss: Implement overlay handoff for continuous splash screen"

This reverts commit 0aefbe045e57aa35709aca00f1775bfbe85fff46.