kvm__arch_init: Remove hugetlbfs_path and ram_size as parameters

The kvm struct already contains a pointer to the configuration, which
contains both hugetlbfs_path and ram_size, so is it not necessary to pass
them as arguments to kvm__arch_init().

Signed-off-by: Julien Grall <julien.grall@arm.com>
Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>