UPSTREAM: regulator: of: Use of_property_read_u32() for reading min/max

UPSTREAM: regulator: of: Use of_property_read_u32() for reading min/max

OF interface provides to read the u32 value via standard interface
of_property_read_u32(). Use this API to read "regulator-min-microvolts"
and "regulator-max-microvolt".

This will make consistent with other property value reads.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit a34785f10d33f70680941da284d7ec3a612aad1a)

Change-Id: I12da714ca47197932e693567e34927a7ddd26f01
Signed-off-by: David Wu <david.wu@rock-chips.com>