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/ioam6_iptunnel.h b/libc/kernel/uapi/linux/ioam6_iptunnel.h
index 7426225..ec1a6a8 100644
--- a/libc/kernel/uapi/linux/ioam6_iptunnel.h
+++ b/libc/kernel/uapi/linux/ioam6_iptunnel.h
@@ -32,6 +32,10 @@
   IOAM6_IPTUNNEL_MODE,
   IOAM6_IPTUNNEL_DST,
   IOAM6_IPTUNNEL_TRACE,
+#define IOAM6_IPTUNNEL_FREQ_MIN 1
+#define IOAM6_IPTUNNEL_FREQ_MAX 1000000
+  IOAM6_IPTUNNEL_FREQ_K,
+  IOAM6_IPTUNNEL_FREQ_N,
   __IOAM6_IPTUNNEL_MAX,
 };
 #define IOAM6_IPTUNNEL_MAX (__IOAM6_IPTUNNEL_MAX - 1)