drm/tegra: Move driver to DRM tree

In order to make subsystem-wide changes easier, move the Tegra DRM
driver back into the DRM tree.

Signed-off-by: Thierry Reding <treding@nvidia.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 89f347a..4907a74 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2816,6 +2816,7 @@
 L:	linux-tegra@vger.kernel.org
 T:	git git://anongit.freedesktop.org/tegra/linux.git
 S:	Maintained
+F:	drivers/gpu/drm/tegra/
 F:	drivers/gpu/host1x/
 F:	include/linux/host1x.h
 F:	include/uapi/drm/tegra_drm.h