device-drivers: uaccess: test access to user-space memory

Test checks kernel API to safely access user-space memory using
copy_to_user(), copy_from_user(), get_user(), put_user() functions.

Signed-off-by: Alexey Kodanev <alexey.kodanev@oracle.com>
device-drivers: uaccess: enable build and run

Signed-off-by: Alexey Kodanev <alexey.kodanev@oracle.com>