linux/common-config: Disable LEGACY_TIOCSTI

See the commit message adding the kconfig:
83efeeeb3d

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;