drm/tegra: don't depend on OF

ARCH_TEGRA always enabled OF, so there's no need for any driver to
depend on it.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>

drivers/gpu/host1x/drm/Kconfig

 config DRM_TEGRA
 	bool "NVIDIA Tegra DRM"
-	depends on DRM && OF
+	depends on DRM
 	select DRM_KMS_HELPER
 	select FB_SYS_FILLRECT
 	select FB_SYS_COPYAREA