unix/linux: update to Linux kernel 5.19-rc2

Update to 5.19-rc2 instead of 5.18 for the following reasons:

- Support for LoongArch has been merged upstream. This allows to drop
  the loong64 specific kernel patches.
- Fixes [1] an issue encountered with when generating the
  SOCK_TXREHASH_DEFAULT constant from linux/socket.h on 5.18
- Contains a fix [2] to provide SYS_MEMFD_SECRET on linux/riscv64 as
  well, The underlying syscall was already available in earlier kernel
  versions. Also see golang/go#51547.

[1] https://lore.kernel.org/r/20220531094345.13801-1-tklauser@distanz.ch
[2] https://lore.kernel.org/r/20220505081815.22808-1-tklauser@distanz.ch

Change-Id: I6c3ec30a067eae339c443ee55962d94c84feffd9
Reviewed-on: https://go-review.googlesource.com/c/sys/+/411375
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
diff --git a/unix/ztypes_linux_loong64.go b/unix/ztypes_linux_loong64.go
index 090ae46..8fe4c52 100644
--- a/unix/ztypes_linux_loong64.go
+++ b/unix/ztypes_linux_loong64.go
@@ -318,6 +318,12 @@
 	Ac_btime64                uint64
 	Compact_count             uint64
 	Compact_delay_total       uint64
+	Ac_tgid                   uint32
+	Ac_tgetime                uint64
+	Ac_exe_dev                uint64
+	Ac_exe_inode              uint64
+	Wpcopy_count              uint64
+	Wpcopy_delay_total        uint64
 }
 
 type cpuMask uint64