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_fddi.h b/libc/kernel/uapi/linux/if_fddi.h
index 4efd7f8..4b5074b 100644
--- a/libc/kernel/uapi/linux/if_fddi.h
+++ b/libc/kernel/uapi/linux/if_fddi.h
@@ -29,6 +29,18 @@
 #define FDDI_K_LLC_ZLEN 13
 #define FDDI_K_LLC_LEN 4491
 #define FDDI_K_OUI_LEN 3
+#define FDDI_FC_K_CLASS_MASK 0x80
+#define FDDI_FC_K_CLASS_SYNC 0x80
+#define FDDI_FC_K_CLASS_ASYNC 0x00
+#define FDDI_FC_K_ALEN_MASK 0x40
+#define FDDI_FC_K_ALEN_48 0x40
+#define FDDI_FC_K_ALEN_16 0x00
+#define FDDI_FC_K_FORMAT_MASK 0x30
+#define FDDI_FC_K_FORMAT_FUTURE 0x30
+#define FDDI_FC_K_FORMAT_IMPLEMENTOR 0x20
+#define FDDI_FC_K_FORMAT_LLC 0x10
+#define FDDI_FC_K_FORMAT_MANAGEMENT 0x00
+#define FDDI_FC_K_CONTROL_MASK 0x0f
 #define FDDI_FC_K_VOID 0x00
 #define FDDI_FC_K_NON_RESTRICTED_TOKEN 0x80
 #define FDDI_FC_K_RESTRICTED_TOKEN 0xC0