drm/lease: make drm_lease.h self-contained

Include <linux/types.h> for types used.
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/3a38688e90bb775380aad5b6aad5dce3d9d87ca7.1709749576.git.jani.nikula@intel.com

include/drm/drm_lease.h

@@ -6,6 +6,8 @@
 #ifndef _DRM_LEASE_H_
 #define _DRM_LEASE_H_
 
+#include <linux/types.h>
+
 struct drm_file;
 struct drm_device;
 struct drm_master;