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/pkt_cls.h b/libc/kernel/uapi/linux/pkt_cls.h
index 1db5d32..580e83e 100644
--- a/libc/kernel/uapi/linux/pkt_cls.h
+++ b/libc/kernel/uapi/linux/pkt_cls.h
@@ -199,7 +199,7 @@
   short offoff;
   short hoff;
   __be32 hmask;
-  struct tc_u32_key keys[0];
+  struct tc_u32_key keys[];
 };
 struct tc_u32_mark {
   __u32 val;
@@ -209,7 +209,7 @@
 struct tc_u32_pcnt {
   __u64 rcnt;
   __u64 rhit;
-  __u64 kcnts[0];
+  __u64 kcnts[];
 };
 #define TC_U32_TERMINAL 1
 #define TC_U32_OFFSET 2
@@ -460,6 +460,8 @@
   TCA_FLOWER_KEY_HASH,
   TCA_FLOWER_KEY_HASH_MASK,
   TCA_FLOWER_KEY_NUM_OF_VLANS,
+  TCA_FLOWER_KEY_PPPOE_SID,
+  TCA_FLOWER_KEY_PPP_PROTO,
   __TCA_FLOWER_MAX,
 };
 #define TCA_FLOWER_MAX (__TCA_FLOWER_MAX - 1)