Update to v6.1 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-6.1

Test: Bionic unit tests pass.
Change-Id: I9414fb5e698a9806b85eb09e37d763849f08a468
diff --git a/libc/kernel/uapi/linux/ipv6.h b/libc/kernel/uapi/linux/ipv6.h
index 757cbda..2e57ed1 100644
--- a/libc/kernel/uapi/linux/ipv6.h
+++ b/libc/kernel/uapi/linux/ipv6.h
@@ -87,8 +87,9 @@
   __be16 payload_len;
   __u8 nexthdr;
   __u8 hop_limit;
-  struct in6_addr saddr;
+  __struct_group(, addrs,, struct in6_addr saddr;
   struct in6_addr daddr;
+ );
 };
 enum {
   DEVCONF_FORWARDING = 0,