drm/radeon/radeon_device: Consume our own header where the prototypes are located

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/radeon/radeon_device.c:637:6: warning: no previous prototype for ‘radeon_device_is_virtual’ [-Wmissing-prototypes]
Acked-by: Christian König <christian.koenig@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/radeon_device.c

@@ -42,6 +42,7 @@
 #include <drm/drm_probe_helper.h>
 #include <drm/radeon_drm.h>
 
+#include "radeon_device.h"
 #include "radeon_reg.h"
 #include "radeon.h"
 #include "atom.h"