Update to v6.0 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-6.0

Test: Boots on coral.
Test: Bionic unit tests pass.
Change-Id: I282de83f23b432bef58214108a93700bdadddf0f
diff --git a/libc/kernel/uapi/linux/if_arcnet.h b/libc/kernel/uapi/linux/if_arcnet.h
index 6aece37..65b07e1 100644
--- a/libc/kernel/uapi/linux/if_arcnet.h
+++ b/libc/kernel/uapi/linux/if_arcnet.h
@@ -40,18 +40,18 @@
   __u8 proto;
   __u8 split_flag;
   __be16 sequence;
-  __u8 payload[0];
+  __u8 payload[];
 };
 #define RFC1201_HDR_SIZE 4
 struct arc_rfc1051 {
   __u8 proto;
-  __u8 payload[0];
+  __u8 payload[];
 };
 #define RFC1051_HDR_SIZE 1
 struct arc_eth_encap {
   __u8 proto;
   struct ethhdr eth;
-  __u8 payload[0];
+  __u8 payload[];
 };
 #define ETH_ENCAP_HDR_SIZE 14
 struct arc_cap {