selftests/vm: Fix test for virtual address range mapping for arm64

Arm64 has 256TB address space so fix the test to pass on Arm as well.

Also remove unneeded numaif header.

Signed-off-by: Michal Suchanek <msuchanek@suse.de>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>