LdParser: Fix position regexp

Position is always followed by colon, not only for .text/.data

Change-Id: I7790c5704423aa57f9752fce1021f67319c58df8
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>