Update to v5.5 kernel headers.

Kernel headers coming from:

Git: https://android.googlesource.com/kernel/common/
Branch: android-mainline
Tag: android-mainline-5.5

Test: Boots on walleye.
Test: Ran bionic-unit-tests on walleye.
Test: Boots on cuttlefish.
Test: Ran bionic-unit-tests on cuttlefish.
Change-Id: I57387d3c31e0ba5ad125ffe291cecf365c7b374e
Merged-In: I57387d3c31e0ba5ad125ffe291cecf365c7b374e
diff --git a/libc/kernel/uapi/linux/io_uring.h b/libc/kernel/uapi/linux/io_uring.h
index 7ae31df..0639a80 100644
--- a/libc/kernel/uapi/linux/io_uring.h
+++ b/libc/kernel/uapi/linux/io_uring.h
@@ -25,7 +25,10 @@
   __u8 flags;
   __u16 ioprio;
   __s32 fd;
-  __u64 off;
+  union {
+    __u64 off;
+    __u64 addr2;
+  };
   __u64 addr;
   __u32 len;
   union {
@@ -35,6 +38,8 @@
     __u32 sync_range_flags;
     __u32 msg_flags;
     __u32 timeout_flags;
+    __u32 accept_flags;
+    __u32 cancel_flags;
   };
   __u64 user_data;
   union {
@@ -45,22 +50,33 @@
 #define IOSQE_FIXED_FILE (1U << 0)
 #define IOSQE_IO_DRAIN (1U << 1)
 #define IOSQE_IO_LINK (1U << 2)
+#define IOSQE_IO_HARDLINK (1U << 3)
 #define IORING_SETUP_IOPOLL (1U << 0)
 #define IORING_SETUP_SQPOLL (1U << 1)
 #define IORING_SETUP_SQ_AFF (1U << 2)
-#define IORING_OP_NOP 0
-#define IORING_OP_READV 1
-#define IORING_OP_WRITEV 2
-#define IORING_OP_FSYNC 3
-#define IORING_OP_READ_FIXED 4
-#define IORING_OP_WRITE_FIXED 5
-#define IORING_OP_POLL_ADD 6
-#define IORING_OP_POLL_REMOVE 7
-#define IORING_OP_SYNC_FILE_RANGE 8
-#define IORING_OP_SENDMSG 9
-#define IORING_OP_RECVMSG 10
-#define IORING_OP_TIMEOUT 11
+#define IORING_SETUP_CQSIZE (1U << 3)
+enum {
+  IORING_OP_NOP,
+  IORING_OP_READV,
+  IORING_OP_WRITEV,
+  IORING_OP_FSYNC,
+  IORING_OP_READ_FIXED,
+  IORING_OP_WRITE_FIXED,
+  IORING_OP_POLL_ADD,
+  IORING_OP_POLL_REMOVE,
+  IORING_OP_SYNC_FILE_RANGE,
+  IORING_OP_SENDMSG,
+  IORING_OP_RECVMSG,
+  IORING_OP_TIMEOUT,
+  IORING_OP_TIMEOUT_REMOVE,
+  IORING_OP_ACCEPT,
+  IORING_OP_ASYNC_CANCEL,
+  IORING_OP_LINK_TIMEOUT,
+  IORING_OP_CONNECT,
+  IORING_OP_LAST,
+};
 #define IORING_FSYNC_DATASYNC (1U << 0)
+#define IORING_TIMEOUT_ABS (1U << 0)
 struct io_uring_cqe {
   __u64 user_data;
   __s32 res;
@@ -104,10 +120,18 @@
   struct io_cqring_offsets cq_off;
 };
 #define IORING_FEAT_SINGLE_MMAP (1U << 0)
+#define IORING_FEAT_NODROP (1U << 1)
+#define IORING_FEAT_SUBMIT_STABLE (1U << 2)
 #define IORING_REGISTER_BUFFERS 0
 #define IORING_UNREGISTER_BUFFERS 1
 #define IORING_REGISTER_FILES 2
 #define IORING_UNREGISTER_FILES 3
 #define IORING_REGISTER_EVENTFD 4
 #define IORING_UNREGISTER_EVENTFD 5
+#define IORING_REGISTER_FILES_UPDATE 6
+struct io_uring_files_update {
+  __u32 offset;
+  __u32 resv;
+  __aligned_u64 fds;
+};
 #endif