drm/imx: Add i.MX8qxp Display Controller KMS

i.MX8qxp Display Controller(DC) is comprised of three main components that
include a blit engine for 2D graphics accelerations, display controller for
display output processing, as well as a command sequencer.  Add kernel
mode setting support for the display controller part with two CRTCs and
two primary planes(backed by FetchLayer and FetchWarp respectively).  The
registers of the display controller are accessed without command sequencer
involved, instead just by using CPU.  The command sequencer is supposed to
be used by the blit engine.

Reviewed-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Liu Ying <victor.liu@nxp.com>
Link: https://lore.kernel.org/r/20250414035028.1561475-13-victor.liu@nxp.com

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