pmdomain: rockchip: Move Kconfig option to the pmdomain subsystem

The Kconfig option belongs closer to the corresponding implementation,
hence let's move it from the soc subsystem to the pmdomain subsystem.

Cc: Heiko Stuebner <heiko@sntech.de>
Cc: <linux-rockchip@lists.infradead.org>
Acked-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/pmdomain/Kconfig

@@ -9,5 +9,6 @@ source "drivers/pmdomain/imx/Kconfig"
 source "drivers/pmdomain/mediatek/Kconfig"
 source "drivers/pmdomain/qcom/Kconfig"
 source "drivers/pmdomain/renesas/Kconfig"
+source "drivers/pmdomain/rockchip/Kconfig"
 
 endmenu

drivers/pmdomain/rockchip/Kconfig

+# SPDX-License-Identifier: GPL-2.0-only
+if ARCH_ROCKCHIP || COMPILE_TEST
+
+config ROCKCHIP_PM_DOMAINS
+	bool "Rockchip generic power domain"
+	depends on PM
+	select PM_GENERIC_DOMAINS
+	help
+	  Say y here to enable power domain support.
+	  In order to meet high performance and low power requirements, a power
+	  management unit is designed or saving power when RK3288 in low power
+	  mode. The RK3288 PMU is dedicated for managing the power of the whole chip.
+
+	  If unsure, say N.
+
+endif

drivers/soc/rockchip/Kconfig

@@ -22,18 +22,6 @@ config ROCKCHIP_IODOMAIN
 	  necessary for the io domain setting of the SoC to match the
 	  voltage supplied by the regulators.
 
-config ROCKCHIP_PM_DOMAINS
-	bool "Rockchip generic power domain"
-	depends on PM
-	select PM_GENERIC_DOMAINS
-	help
-	  Say y here to enable power domain support.
-	  In order to meet high performance and low power requirements, a power
-	  management unit is designed or saving power when RK3288 in low power
-	  mode. The RK3288 PMU is dedicated for managing the power of the whole chip.
-
-	  If unsure, say N.
-
 config ROCKCHIP_DTPM
 	tristate "Rockchip DTPM hierarchy"
 	depends on DTPM && m