Update to v4.15 kernel headers.

Test: Compiles, boots bullhead/hikey960.
Change-Id: I118beb8b6cac0881b1270f9bf6981959297a41a8
diff --git a/libc/kernel/uapi/drm/drm_mode.h b/libc/kernel/uapi/drm/drm_mode.h
index 5e97a72..2c9defb 100644
--- a/libc/kernel/uapi/drm/drm_mode.h
+++ b/libc/kernel/uapi/drm/drm_mode.h
@@ -427,6 +427,26 @@
 struct drm_mode_destroy_blob {
   __u32 blob_id;
 };
+struct drm_mode_create_lease {
+  __u64 object_ids;
+  __u32 object_count;
+  __u32 flags;
+  __u32 lessee_id;
+  __u32 fd;
+};
+struct drm_mode_list_lessees {
+  __u32 count_lessees;
+  __u32 pad;
+  __u64 lessees_ptr;
+};
+struct drm_mode_get_lease {
+  __u32 count_objects;
+  __u32 pad;
+  __u64 objects_ptr;
+};
+struct drm_mode_revoke_lease {
+  __u32 lessee_id;
+};
 #ifdef __cplusplus
 #endif
 #endif