ARM: rockchip: Set name of pmu regmap_config in smp code

We are now allowing to register debugfs without a valid device, and not
having a valid name will end up using "dummy*" to create debugfs dir.

Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>