kasan: remove redundant config option
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.11.16 by commit 86463b30e4ef70c4551a94cb68b5a667c2e00846, it was introduced in version v5.11.7 by commit 8f105cac6c48f62147a7a15db51ebbe7b4c27377. For more details please see the references link.