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_pppox.h b/libc/kernel/uapi/linux/if_pppox.h
index 40d25e8..b6c076b 100644
--- a/libc/kernel/uapi/linux/if_pppox.h
+++ b/libc/kernel/uapi/linux/if_pppox.h
@@ -82,7 +82,7 @@
 struct pppoe_tag {
   __be16 tag_type;
   __be16 tag_len;
-  char tag_data[0];
+  char tag_data[];
 } __attribute__((packed));
 #define PTT_EOL __cpu_to_be16(0x0000)
 #define PTT_SRV_NAME __cpu_to_be16(0x0101)
@@ -107,7 +107,7 @@
   __u8 code;
   __be16 sid;
   __be16 length;
-  struct pppoe_tag tag[0];
+  struct pppoe_tag tag[];
 } __packed;
 #define PPPOE_SES_HLEN 8
 #endif