drm: omapdrm: Remove filename from header and fix copyright tag

Having the filename in the header serves little purpose and is
often wrong after renames as it is here in several places, just
drop it from all omapdrm files.

While we are here unify the copyright tags to the TI recommended style.

Signed-off-by: Andrew F. Davis <afd@ti.com>

drivers/gpu/drm/omapdrm/dss/dsi.c

@@ -1,6 +1,4 @@
 /*
- * linux/drivers/video/omap2/dss/dsi.c
- *
  * Copyright (C) 2009 Nokia Corporation
  * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
  *