Update to v5.18 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-5.18

Test: Builds.
Test: All bionic unit tests pass on a coral device.
Change-Id: I5700813eec0fb0db55bee4d75b129400b7a239bd
diff --git a/libc/kernel/uapi/linux/btrfs_tree.h b/libc/kernel/uapi/linux/btrfs_tree.h
index 0476733..8e3c6fe 100644
--- a/libc/kernel/uapi/linux/btrfs_tree.h
+++ b/libc/kernel/uapi/linux/btrfs_tree.h
@@ -31,6 +31,7 @@
 #define BTRFS_QUOTA_TREE_OBJECTID 8ULL
 #define BTRFS_UUID_TREE_OBJECTID 9ULL
 #define BTRFS_FREE_SPACE_TREE_OBJECTID 10ULL
+#define BTRFS_BLOCK_GROUP_TREE_OBJECTID 11ULL
 #define BTRFS_DEV_STATS_OBJECTID 0ULL
 #define BTRFS_BALANCE_OBJECTID - 4ULL
 #define BTRFS_ORPHAN_OBJECTID - 5ULL