drm: Add plane->name and use it in debug prints

Show a sensible name for the plane in debug mesages. The driver
may supply its own name, otherwise the core genrates the name
("plane-0", "plane-1" etc.).

v2: kstrdup() the name passed by the caller (Jani)
v3: Generate a default name if the driver doesn't supply one

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1449592922-5545-7-git-send-email-ville.syrjala@linux.intel.com
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 4bea0a1..c2f98ba 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -1496,6 +1496,8 @@
 	struct drm_device *dev;
 	struct list_head head;
 
+	char *name;
+
 	struct drm_modeset_lock mutex;
 
 	struct drm_mode_object base;