regulator: rtq2208: Fix uninitialized use of regulator_config

Fix rtq2208 driver uninitialized use to cause kernel error.

Fixes: 85a11f55 ("regulator: rtq2208: Add Richtek RTQ2208 SubPMIC")
Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
Link: https://patch.msgid.link/00d691cfcc0eae9ce80a37b62e99851e8fdcffe2.1729829243.git.cy_huang@richtek.com


Signed-off-by: Mark Brown <broonie@kernel.org>