Update to v4.20.1 kernel headers.

This includes one manual change:

In the file bionic/libc/kernel/uapi/linux/in.h, the macro IN_BADCLASS
was not definied correctly. Change the macro from:

  #define IN_BADCLASS(a) ((((long int) (a)) == 0xffffffff)

to:

  #define IN_BADCLASS(a) (((long int) (a)) == (long int)0xffffffff)

This change is being pushed to the upstream kernels.

Test: Builds and boots.
Change-Id: Ia304773a9dc6789b34d9769d73742384d6afb571
Merged-In: Ia304773a9dc6789b34d9769d73742384d6afb571
(cherry picked from commit 967fb01cce73591281e7804e2c0fa9f83b618f5b)
diff --git a/libc/kernel/uapi/linux/if_link.h b/libc/kernel/uapi/linux/if_link.h
index 4bbf21d..2c80d3d 100644
--- a/libc/kernel/uapi/linux/if_link.h
+++ b/libc/kernel/uapi/linux/if_link.h
@@ -138,6 +138,7 @@
   IFLA_EVENT,
   IFLA_NEW_NETNSID,
   IFLA_IF_NETNSID,
+  IFLA_TARGET_NETNSID = IFLA_IF_NETNSID,
   IFLA_CARRIER_UP_COUNT,
   IFLA_CARRIER_DOWN_COUNT,
   IFLA_NEW_IFINDEX,
@@ -219,6 +220,7 @@
   IFLA_BR_MCAST_STATS_ENABLED,
   IFLA_BR_MCAST_IGMP_VERSION,
   IFLA_BR_MCAST_MLD_VERSION,
+  IFLA_BR_VLAN_STATS_PER_PORT,
   __IFLA_BR_MAX,
 };
 #define IFLA_BR_MAX (__IFLA_BR_MAX - 1)
@@ -444,6 +446,7 @@
   IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
   IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
   IFLA_GENEVE_LABEL,
+  IFLA_GENEVE_TTL_INHERIT,
   __IFLA_GENEVE_MAX
 };
 #define IFLA_GENEVE_MAX (__IFLA_GENEVE_MAX - 1)