Documentation/DocBook: remove gpu.tmpl

The gpu documentation has now been converted to reStructuredText files
under Documentation/gpu. Remove the obsolete DocBook template. Also
remove it from MAINTAINERS.

Good riddance.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/8d673f75fe686371ed9838682c368a4e3b96bf54.1466506505.git.jani.nikula@intel.com

Documentation/DocBook/Makefile

@@ -14,7 +14,7 @@ DOCBOOKS := z8530book.xml device-drivers.xml \
 	    genericirq.xml s390-drivers.xml uio-howto.xml scsi.xml \
 	    80211.xml debugobjects.xml sh.xml regulator.xml \
 	    alsa-driver-api.xml writing-an-alsa-driver.xml \
-	    tracepoint.xml gpu.xml media_api.xml w1.xml \
+	    tracepoint.xml media_api.xml w1.xml \
 	    writing_musb_glue_layer.xml crypto-API.xml iio.xml
 
 include Documentation/DocBook/media/Makefile

MAINTAINERS

@@ -3858,7 +3858,6 @@ F:	Documentation/devicetree/bindings/display/
 F:	Documentation/devicetree/bindings/gpu/
 F:	Documentation/devicetree/bindings/video/
 F:	Documentation/gpu/
-F:	Documentation/DocBook/gpu.*
 F:	include/drm/
 F:	include/uapi/drm/