nitroenclaves: Use getuserpagesunlocked() call to handle mmap assert
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 v5.15.13 by commit 90d2beed5e753805c5eab656b8d48257638fe543, it was introduced in version v5.15 by commit 5b78ed24e8ec48602c1d6f5a188e58d000c81e2b. For more details please see the references link.