Update to kernel headers v5.2.

Test: Booted a taimen, ran unit bionic unit tests.
Change-Id: I3522c59793bbcef98ea515996a481d92f14b8816
diff --git a/libc/kernel/uapi/linux/io_uring.h b/libc/kernel/uapi/linux/io_uring.h
index fe2d0eb..434b24b 100644
--- a/libc/kernel/uapi/linux/io_uring.h
+++ b/libc/kernel/uapi/linux/io_uring.h
@@ -32,6 +32,7 @@
     __kernel_rwf_t rw_flags;
     __u32 fsync_flags;
     __u16 poll_events;
+    __u32 sync_range_flags;
   };
   __u64 user_data;
   union {
@@ -40,6 +41,7 @@
   };
 };
 #define IOSQE_FIXED_FILE (1U << 0)
+#define IOSQE_IO_DRAIN (1U << 1)
 #define IORING_SETUP_IOPOLL (1U << 0)
 #define IORING_SETUP_SQPOLL (1U << 1)
 #define IORING_SETUP_SQ_AFF (1U << 2)
@@ -51,6 +53,7 @@
 #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_FSYNC_DATASYNC (1U << 0)
 struct io_uring_cqe {
   __u64 user_data;
@@ -97,4 +100,6 @@
 #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
 #endif