staging: drm/omap: add support for ARCH_MULTIPLATFORM

Remove usage of plat/cpu.h and get information from platform data
instead.  This enables omapdrm to be built with ARCH_MULTIPLATFORM.

Signed-off-by: Rob Clark <rob@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/include/linux/platform_data/omap_drm.h b/include/linux/platform_data/omap_drm.h
index 3da73bdc..f4e4a23 100644
--- a/include/linux/platform_data/omap_drm.h
+++ b/include/linux/platform_data/omap_drm.h
@@ -46,6 +46,7 @@
 };
 
 struct omap_drm_platform_data {
+	uint32_t omaprev;
 	struct omap_kms_platform_data *kms_pdata;
 };