Update to v5.6 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-5.6

Add a new method for removing structures. This is to deal with the kernel
headers changing some definitions of timeval to __kernel_old_timeval
and itimerval to __kernel_old_itimerval. Remove the __kernel_old_XX
strutures and change the other structures to the previous definitions.

This only works so long as these structures stay the same, if they
diverge, then a different strategy will need to be implemented.

Test: Booted cuttlefish/walleye.
Test: Ran bionic-unit-tests on cuttlefish/walleye.
Change-Id: I0a61f4fa6e4155c602e0414d9b38c2e1637829af
diff --git a/libc/kernel/uapi/linux/audit.h b/libc/kernel/uapi/linux/audit.h
index d14f018..a4bb3b5 100644
--- a/libc/kernel/uapi/linux/audit.h
+++ b/libc/kernel/uapi/linux/audit.h
@@ -81,6 +81,7 @@
 #define AUDIT_FANOTIFY 1331
 #define AUDIT_TIME_INJOFFSET 1332
 #define AUDIT_TIME_ADJNTPVAL 1333
+#define AUDIT_BPF 1334
 #define AUDIT_AVC 1400
 #define AUDIT_SELINUX_ERR 1401
 #define AUDIT_AVC_PATH 1402