MAINTAINERS: Match on dma_buf|fence|resv anywhere

I've spent a bit too much time reviewing all kinds of users all over
the kernel for this buffer sharing infrastructure. And some of it is
at least questionable.

Make sure we at least see when this stuff flies by.
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Acked-by: Sumit Semwal <sumit.semwal@linaro.org>
Acked-by: Dave Airlie <airlied@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Rob Herring <robh@kernel.org>
Cc: linux-media@vger.kernel.org
Cc: linaro-mm-sig@lists.linaro.org
Link: https://patchwork.freedesktop.org/patch/msgid/20191204215105.874074-1-daniel.vetter@ffwll.ch

MAINTAINERS

@@ -4941,6 +4941,7 @@ F:	include/linux/dma-buf*
 F:	include/linux/reservation.h
 F:	include/linux/*fence.h
 F:	Documentation/driver-api/dma-buf.rst
+K:	dma_(buf|fence|resv)
 T:	git git://anongit.freedesktop.org/drm/drm-misc
 
 DMA GENERIC OFFLOAD ENGINE SUBSYSTEM