regulators: max77693: register driver earlier to avoid deferred probe

MAX77693 based regulators are used by USB gadget subsystem, which
doesn't support deferred probe, so the driver should be registered
before USB gadget drivers get probed.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>