gma500: Fix dependencies

ACPI Video is used by GMA500 so we need to depend upon it
Signed-off-by: NAlan Cox <alan@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/gma500/Kconfig

 config DRM_PSB
 	tristate "Intel GMA5/600 KMS Framebuffer"
-	depends on DRM && PCI && X86
+	depends on DRM && PCI && X86 && ACPI_VIDEO
 	select FB_CFB_COPYAREA
         select FB_CFB_FILLRECT
         select FB_CFB_IMAGEBLIT