cifs-utils: make samba conditional dependency

Add PACKAGECONFIG for cifsacl and update PACKAGECONFIG for cifsidmap
to make samba a conditional dependency. It is nice to be able to
get mount.cifs without needing to build samba.

Signed-off-by: S. Lockwood-Childs <sjl@vctlabs.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>
(cherry picked from commit a6a36710a110d381b798b445b2da9d6c490215f3)
Signed-off-by: Armin Kuster <akuster808@gmail.com>