regulator: rn5t618: Convert to new style DT parsing
regulator: rn5t618: Convert to new style DT parsing

Use the simplified DT parsing method to remove some duplicated
code.

Since this is a MFD subdevice and its device object doesn't have an
associated DT node, the configuration instance used to register the
regulators has been changed to point to the parent device.

Signed-off-by: Beniamino Galvani <0a204c0ed8670f52f51e6619404e025b8f375a15@gmail.com>
Signed-off-by: Mark Brown <b51b9a92386687a9ac927cebfa0f978adeb8cea5@kernel.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs