unix: add fs-verity consts and types

See https://www.kernel.org/doc/html/latest/filesystems/fsverity.html for
details.

Change-Id: I5b02d0ef84f21d05ea3f1ac8e905232733ea3739
Reviewed-on: https://go-review.googlesource.com/c/sys/+/225698
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/unix/zerrors_linux_amd64.go b/unix/zerrors_linux_amd64.go
index d5be2e8..005970f 100644
--- a/unix/zerrors_linux_amd64.go
+++ b/unix/zerrors_linux_amd64.go
@@ -73,6 +73,8 @@
 	FFDLY                            = 0x8000
 	FLUSHO                           = 0x1000
 	FP_XSTATE_MAGIC2                 = 0x46505845
+	FS_IOC_ENABLE_VERITY             = 0x40806685
+	FS_IOC_GETFLAGS                  = 0x80086601
 	FS_IOC_GET_ENCRYPTION_POLICY     = 0x400c6615
 	FS_IOC_GET_ENCRYPTION_PWSALT     = 0x40106614
 	FS_IOC_SET_ENCRYPTION_POLICY     = 0x800c6613