ARM: OMAP: Make omap_device local to mach-omap2

Let's make omap_device local to mach-omap2 for
ARM common zImage support.

Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/drm.c

@@ -24,7 +24,7 @@
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
 
-#include <plat/omap_device.h>
+#include "omap_device.h"
 #include <plat/omap_hwmod.h>
 
 #if defined(CONFIG_DRM_OMAP) || (CONFIG_DRM_OMAP_MODULE)