pksc11-helper: Fix QA warnings

WARNING: QA Issue: pkcs11-helper rdepends on nspr, but it isn't a build dependency? [build-deps]
WARNING: QA Issue: pkcs11-helper rdepends on nss, but it isn't a build dependency? [build-deps]

Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>