msm: sde: add early display handoff feature

When enabling animation/static splash in LK, drm/kms driver needs
to involve handoff code to support smooth transition. In display
driver's probe, it will do following items:
1. Check the status in LK for early splash.
2. Add data bus bandwidth voting in function sde_splash_init.
2. Handle SMMU mapping issue to avoid SMMU fault problem.
3. Bypass hardware reset to avoid glitch.

And after user's space is up, when first commit's vblank comes,
it will call functions to:
1. Tell LK to stop static/animation display and to exit.
2. Set early_domain_map_attr to 1 to enable stage 1 translation in
   iommu driver.
3. Check the property of commit.If it's for HDMI, release HDMI
resource. If for DSI, release DSI resource.
4. Recycle the memory to be available to system.
5. Withdraw the bus bandwidth voting.

Change-Id: If425f044e2c40301eed57375a33a26ec1970abd5
Signed-off-by: Guchun Chen <guchunc@codeaurora.org>