drm/msm/sde: add qseed4 support

Expose dynamic expansion flag in sde_drm_scaler_v2 structure,
add blend ratio HW programming for unsharp mask filters and
set default preload values based on scaler version.

Change-Id: I42804018dfe8cf08ef4d7e1e540fa01f4bdf5d0f
Signed-off-by: Alexander Beykun <abeykun@codeaurora.org>