Looking up init data for regulators found on chips is a common operation
that can be handled in a generic way. The new helper function introduced
by this patch looks up the children of a given node by names specified
in a match table and fills that match table with information parsed from
the DT.

This is based on work by Rhyland Klein <rklein@nvidia.com>.
Signed-off-by: NThierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>