drm: Give drm_agp_clear drm_legacy_ prefix

It has a  DRIVER_MODESET check to sure make it's not creating havoc
for drm drivers. Make that clear in the name too.

v2: Move misplaced hunk, spotted by 0day and Thierry.

Cc: Thierry Reding <thierry.reding@gmail.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1461691808-12414-2-git-send-email-daniel.vetter@ffwll.ch
diff --git a/include/drm/drm_agpsupport.h b/include/drm/drm_agpsupport.h
index 193ef19..b2d9126 100644
--- a/include/drm/drm_agpsupport.h
+++ b/include/drm/drm_agpsupport.h
@@ -37,7 +37,7 @@
 				uint32_t type);
 
 struct drm_agp_head *drm_agp_init(struct drm_device *dev);
-void drm_agp_clear(struct drm_device *dev);
+void drm_legacy_agp_clear(struct drm_device *dev);
 int drm_agp_acquire(struct drm_device *dev);
 int drm_agp_acquire_ioctl(struct drm_device *dev, void *data,
 			  struct drm_file *file_priv);
@@ -93,7 +93,7 @@
 	return NULL;
 }
 
-static inline void drm_agp_clear(struct drm_device *dev)
+static inline void drm_legacy_agp_clear(struct drm_device *dev)
 {
 }