Update to v6.4 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-6.4

Test: Bionic unit tests pass.
Change-Id: I991f8eaa2b272a464166addb13e6bdc63734444d
diff --git a/libc/kernel/uapi/linux/user_events.h b/libc/kernel/uapi/linux/user_events.h
new file mode 100644
index 0000000..f26519e
--- /dev/null
+++ b/libc/kernel/uapi/linux/user_events.h
@@ -0,0 +1,46 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   This header was automatically generated from a Linux kernel header
+ ***   of the same name, to make information necessary for userspace to
+ ***   call into the kernel available to libc.  It contains only constants,
+ ***   structures, and macros generated from the original header, and thus,
+ ***   contains no copyrightable information.
+ ***
+ ***   To edit the content of this header, modify the corresponding
+ ***   source file (e.g. under external/kernel-headers/original/) then
+ ***   run bionic/libc/kernel/tools/update_all.py
+ ***
+ ***   Any manual change here will be lost the next time this script will
+ ***   be run. You've been warned!
+ ***
+ ****************************************************************************
+ ****************************************************************************/
+#ifndef _UAPI_LINUX_USER_EVENTS_H
+#define _UAPI_LINUX_USER_EVENTS_H
+#include <linux/types.h>
+#include <linux/ioctl.h>
+#define USER_EVENTS_SYSTEM "user_events"
+#define USER_EVENTS_PREFIX "u:"
+#define DYN_LOC(offset,size) ((size) << 16 | (offset))
+struct user_reg {
+  __u32 size;
+  __u8 enable_bit;
+  __u8 enable_size;
+  __u16 flags;
+  __u64 enable_addr;
+  __u64 name_args;
+  __u32 write_index;
+} __attribute__((__packed__));
+struct user_unreg {
+  __u32 size;
+  __u8 disable_bit;
+  __u8 __reserved;
+  __u16 __reserved2;
+  __u64 disable_addr;
+} __attribute__((__packed__));
+#define DIAG_IOC_MAGIC '*'
+#define DIAG_IOCSREG _IOWR(DIAG_IOC_MAGIC, 0, struct user_reg *)
+#define DIAG_IOCSDEL _IOW(DIAG_IOC_MAGIC, 1, char *)
+#define DIAG_IOCSUNREG _IOW(DIAG_IOC_MAGIC, 2, struct user_unreg *)
+#endif