MAINTAINERS: Add Lukas Wunner as reviewer for vga_switcheroo

I've been contributing to vga_switcheroo for the past two years and by
now am fairly familiar with it, so danvet suggested that I add myself
as reviewer.

While at it, add missing file pattern for vga_switcheroo.h + vgaarb.h
to the DRM and DRM-MISC sections such that get_maintainer.pl returns
dri-devel@ and the drm-misc maintainers.
Suggested-and-acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Link: http://patchwork.freedesktop.org/patch/msgid/ff2320a0790d039e714cf352cf32ec16fa370627.1490623913.git.lukas@wunner.de

MAINTAINERS

@@ -4146,6 +4146,7 @@ F:	Documentation/devicetree/bindings/video/
 F:	Documentation/gpu/
 F:	include/drm/
 F:	include/uapi/drm/
+F:	include/linux/vga*
 
 DRM DRIVERS AND MISC GPU PATCHES
 M:	Daniel Vetter <daniel.vetter@intel.com>
@@ -4159,6 +4160,7 @@ F:	drivers/gpu/vga/
 F:	drivers/gpu/drm/*
 F:	include/drm/drm*
 F:	include/uapi/drm/drm*
+F:	include/linux/vga*
 
 DRM DRIVER FOR AST SERVER GRAPHICS CHIPS
 M:	Dave Airlie <airlied@redhat.com>
@@ -13263,6 +13265,14 @@ L:	kvm@vger.kernel.org
 S:	Maintained
 F:	drivers/vfio/platform/
 
+VGA_SWITCHEROO
+R:	Lukas Wunner <lukas@wunner.de>
+S:	Maintained
+F:	Documentation/gpu/vga-switcheroo.rst
+F:	drivers/gpu/vga/vga_switcheroo.c
+F:	include/linux/vga_switcheroo.h
+T:	git git://anongit.freedesktop.org/drm/drm-misc
+
 VIDEOBUF2 FRAMEWORK
 M:	Pawel Osciak <pawel@osciak.com>
 M:	Marek Szyprowski <m.szyprowski@samsung.com>