Update to v4.19 kernel headers.

Test: Builds and boots.
Change-Id: I99a9ed79666e143b47f02ca4e59eed94f69b7e4a
(cherry picked from commit a981e2e52e2e95a65fa9c9b6fb16dcb4c83dd576)
diff --git a/libc/kernel/uapi/linux/auto_fs4.h b/libc/kernel/uapi/linux/auto_fs4.h
index be6766b..41f3c8c 100644
--- a/libc/kernel/uapi/linux/auto_fs4.h
+++ b/libc/kernel/uapi/linux/auto_fs4.h
@@ -16,75 +16,7 @@
  ***
  ****************************************************************************
  ****************************************************************************/
-#ifndef _LINUX_AUTO_FS4_H
-#define _LINUX_AUTO_FS4_H
-#include <linux/types.h>
+#ifndef _UAPI_LINUX_AUTO_FS4_H
+#define _UAPI_LINUX_AUTO_FS4_H
 #include <linux/auto_fs.h>
-#undef AUTOFS_PROTO_VERSION
-#undef AUTOFS_MIN_PROTO_VERSION
-#undef AUTOFS_MAX_PROTO_VERSION
-#define AUTOFS_PROTO_VERSION 5
-#define AUTOFS_MIN_PROTO_VERSION 3
-#define AUTOFS_MAX_PROTO_VERSION 5
-#define AUTOFS_PROTO_SUBVERSION 2
-#define AUTOFS_EXP_IMMEDIATE 1
-#define AUTOFS_EXP_LEAVES 2
-#define AUTOFS_TYPE_ANY 0U
-#define AUTOFS_TYPE_INDIRECT 1U
-#define AUTOFS_TYPE_DIRECT 2U
-#define AUTOFS_TYPE_OFFSET 4U
-enum autofs_notify {
-  NFY_NONE,
-  NFY_MOUNT,
-  NFY_EXPIRE
-};
-#define autofs_ptype_expire_multi 2
-#define autofs_ptype_missing_indirect 3
-#define autofs_ptype_expire_indirect 4
-#define autofs_ptype_missing_direct 5
-#define autofs_ptype_expire_direct 6
-struct autofs_packet_expire_multi {
-  struct autofs_packet_hdr hdr;
-  autofs_wqt_t wait_queue_token;
-  int len;
-  char name[NAME_MAX + 1];
-};
-union autofs_packet_union {
-  struct autofs_packet_hdr hdr;
-  struct autofs_packet_missing missing;
-  struct autofs_packet_expire expire;
-  struct autofs_packet_expire_multi expire_multi;
-};
-struct autofs_v5_packet {
-  struct autofs_packet_hdr hdr;
-  autofs_wqt_t wait_queue_token;
-  __u32 dev;
-  __u64 ino;
-  __u32 uid;
-  __u32 gid;
-  __u32 pid;
-  __u32 tgid;
-  __u32 len;
-  char name[NAME_MAX + 1];
-};
-typedef struct autofs_v5_packet autofs_packet_missing_indirect_t;
-typedef struct autofs_v5_packet autofs_packet_expire_indirect_t;
-typedef struct autofs_v5_packet autofs_packet_missing_direct_t;
-typedef struct autofs_v5_packet autofs_packet_expire_direct_t;
-union autofs_v5_packet_union {
-  struct autofs_packet_hdr hdr;
-  struct autofs_v5_packet v5_packet;
-  autofs_packet_missing_indirect_t missing_indirect;
-  autofs_packet_expire_indirect_t expire_indirect;
-  autofs_packet_missing_direct_t missing_direct;
-  autofs_packet_expire_direct_t expire_direct;
-};
-enum {
-  AUTOFS_IOC_EXPIRE_MULTI_CMD = 0x66,
-  AUTOFS_IOC_PROTOSUBVER_CMD,
-  AUTOFS_IOC_ASKUMOUNT_CMD = 0x70,
-};
-#define AUTOFS_IOC_EXPIRE_MULTI _IOW(AUTOFS_IOCTL, AUTOFS_IOC_EXPIRE_MULTI_CMD, int)
-#define AUTOFS_IOC_PROTOSUBVER _IOR(AUTOFS_IOCTL, AUTOFS_IOC_PROTOSUBVER_CMD, int)
-#define AUTOFS_IOC_ASKUMOUNT _IOR(AUTOFS_IOCTL, AUTOFS_IOC_ASKUMOUNT_CMD, int)
 #endif