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>

unix/zerrors_linux_arm64.go

@@ -323,6 +323,7 @@ const (
 	SO_RCVBUF                        = 0x8
 	SO_RCVBUFFORCE                   = 0x21
 	SO_RCVLOWAT                      = 0x12
+	SO_RCVMARK                       = 0x4b
 	SO_RCVTIMEO                      = 0x14
 	SO_RCVTIMEO_NEW                  = 0x42
 	SO_RCVTIMEO_OLD                  = 0x14
@@ -347,6 +348,7 @@ const (
 	SO_TIMESTAMPNS_NEW               = 0x40
 	SO_TIMESTAMPNS_OLD               = 0x23
 	SO_TIMESTAMP_NEW                 = 0x3f
+	SO_TXREHASH                      = 0x4a
 	SO_TXTIME                        = 0x3d
 	SO_TYPE                          = 0x3
 	SO_WIFI_STATUS                   = 0x29
@@ -511,6 +513,7 @@ const (
 	WORDSIZE                         = 0x40
 	XCASE                            = 0x4
 	XTABS                            = 0x1800
+	ZA_MAGIC                         = 0x54366345
 	_HIDIOCGRAWNAME                  = 0x80804804
 	_HIDIOCGRAWPHYS                  = 0x80404805
 	_HIDIOCGRAWUNIQ                  = 0x80404808