linux-wandboard

MLK-14369 epdc: sync LUT status to PXP before enable collision detection

on imx7d and imx6ull/imx6sll, the collision detection logic is implemented
in PXP WFE (A on imx7d, or B on imx6ull/imx6sll) instead of the logic
implemented on EPDC on previous SoCs (like imx6sl/imx6dl). The driver need
read the LUT status and send this information to PXP WFE (A on imx7d, or B
on imx6ull/imx6sll) engine, so that PXP WFE engine can detect if there is
an active LUT assigned to the pixels affected by current update.
Without this patch, there could possibly be some false collision report due
to the out-of-sync. The patch intends to fix it.

Signed-off-by: Robby Cai <robby.cai@nxp.com>