MIPS: DTS: qi_lb60: Don't use unit address for regulators

The regulators don't have any "reg" property, and therefore shouldn't
use an unit address in their node names.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>