linux/common-config: Disable LEGACY_TIOCSTI

See the commit message adding the kconfig:
https://github.com/torvalds/linux/commit/83efeeeb3d04b22aaed1df99bc70a48fe9d22c4d

At least Fedora and Arch both appear to disable this on their kernels.

pkgs/os-specific/linux/kernel/common-config.nix

@@ -1409,6 +1409,8 @@ let
         TASK_XACCT = yes;
         TASK_IO_ACCOUNTING = yes;
 
+        LEGACY_TIOCSTI = whenAtLeast "6.2" no;
+
         # Fresh toolchains frequently break -Werror build for minor issues.
         WERROR = whenAtLeast "5.15" no;