Config.uk: Add LIBUKMMAP dependency

Config.uk: Add LIBUKMMAP dependency

`mprotect()` is required and it is part of the `ukmmap` internal
Unikraft library. Add required dependency to `Config.uk`.

Signed-off-by: Razvan Deaconescu <razvan.deaconescu@cs.pub.ro>
Reviewed-by: Stefan Jumarea <stefanjumarea02@gmail.com>
Reviewed-by: Maria Sfiraiala <maria.sfiraiala@gmail.com>
Approved-by: Marc Rittinghaus <marc.rittinghaus@kit.edu>
Tested-by: Unikraft CI <monkey@unikraft.io>
GitHub-Closes: #5