staging: drm/imx: add support for ARCH_MULTIPLATFORM
staging: drm/imx: add support for ARCH_MULTIPLATFORM

No dependency on plat headers, so only needs Kconfig update to
build for ARCH_MULTIPLATFORM.

Signed-off-by: Rob Clark <7e09c9d3e96378bf549fc283fd6e1e5b7014cc33@ti.com>
Acked-by: Sascha Hauer <c00cbc2b736c26791a3822db86f8796fe9efff67@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <4645f7897fd33786a2ee1264d590b3c400559d85@linuxfoundation.org>

KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs