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/vm_sockets.h b/libc/kernel/uapi/linux/vm_sockets.h
index 87e4ba0..3dc4bcf 100644
--- a/libc/kernel/uapi/linux/vm_sockets.h
+++ b/libc/kernel/uapi/linux/vm_sockets.h
@@ -29,7 +29,7 @@
 #define VMADDR_CID_ANY - 1U
 #define VMADDR_PORT_ANY - 1U
 #define VMADDR_CID_HYPERVISOR 0
-#define VMADDR_CID_RESERVED 1
+#define VMADDR_CID_LOCAL 1
 #define VMADDR_CID_HOST 2
 #define VM_SOCKETS_INVALID_VERSION - 1U
 #define VM_SOCKETS_VERSION_EPOCH(_v) (((_v) & 0xFF000000) >> 24)