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/magic.h b/libc/kernel/uapi/linux/magic.h
index ca1daea..439c0ac 100644
--- a/libc/kernel/uapi/linux/magic.h
+++ b/libc/kernel/uapi/linux/magic.h
@@ -93,6 +93,7 @@
 #define NSFS_MAGIC 0x6e736673
 #define BPF_FS_MAGIC 0xcafe4a11
 #define AAFS_MAGIC 0x5a3c69f0
+#define ZONEFS_MAGIC 0x5a4f4653
 #define UDF_SUPER_MAGIC 0x15013346
 #define BALLOON_KVM_MAGIC 0x13661366
 #define ZSMALLOC_MAGIC 0x58295829