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/if_tunnel.h b/libc/kernel/uapi/linux/if_tunnel.h
index 8e1847f..01c2dc9 100644
--- a/libc/kernel/uapi/linux/if_tunnel.h
+++ b/libc/kernel/uapi/linux/if_tunnel.h
@@ -169,5 +169,6 @@
 #define TUNNEL_VXLAN_OPT __cpu_to_be16(0x1000)
 #define TUNNEL_NOCACHE __cpu_to_be16(0x2000)
 #define TUNNEL_ERSPAN_OPT __cpu_to_be16(0x4000)
-#define TUNNEL_OPTIONS_PRESENT (TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT | TUNNEL_ERSPAN_OPT)
+#define TUNNEL_GTP_OPT __cpu_to_be16(0x8000)
+#define TUNNEL_OPTIONS_PRESENT (TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT | TUNNEL_ERSPAN_OPT | TUNNEL_GTP_OPT)
 #endif