regulator: dt: regulator match by regulator-compatible

Match the device's regulators with the property of
"regulator-compatible" of each regulator node.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>