linux-imx

LF-407-1: drm/imx/dcss: fix compilation issues after rebase

Upstream demoved the drmP.h header file. This patch replaces it with the
appropriate headers.

Signed-off-by: Laurentiu Palcu <laurentiu.palcu@nxp.com>
Reviewed-by: Robert Chiras <robert.chiras@nxp.com>