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_addr.h b/libc/kernel/uapi/linux/if_addr.h
index 6a6b640..a225e69 100644
--- a/libc/kernel/uapi/linux/if_addr.h
+++ b/libc/kernel/uapi/linux/if_addr.h
@@ -39,6 +39,7 @@
   IFA_FLAGS,
   IFA_RT_PRIORITY,
   IFA_TARGET_NETNSID,
+  IFA_PROTO,
   __IFA_MAX,
 };
 #define IFA_MAX (__IFA_MAX - 1)
@@ -63,4 +64,8 @@
 };
 #define IFA_RTA(r) ((struct rtattr *) (((char *) (r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
 #define IFA_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct ifaddrmsg))
+#define IFAPROT_UNSPEC 0
+#define IFAPROT_KERNEL_LO 1
+#define IFAPROT_KERNEL_RA 2
+#define IFAPROT_KERNEL_LL 3
 #endif