pmdomain: xilinx: 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: Michal Simek <[e-mail]>
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/pmdomain/Kconfig

···
 source "drivers/pmdomain/sunxi/Kconfig"
 source "drivers/pmdomain/tegra/Kconfig"
 source "drivers/pmdomain/ti/Kconfig"
+source "drivers/pmdomain/xilinx/Kconfig"
 
 endmenu

drivers/pmdomain/xilinx/Kconfig

···
+# SPDX-License-Identifier: GPL-2.0
+
+config ZYNQMP_PM_DOMAINS
+	bool "Enable Zynq MPSoC generic PM domains"
+	default y
+	depends on PM && ZYNQMP_FIRMWARE
+	select PM_GENERIC_DOMAINS
+	help
+	  Say yes to enable device power management through PM domains
+	  If in doubt, say N.

drivers/soc/xilinx/Kconfig

···
 
 	  If in doubt, say N.
 
-config ZYNQMP_PM_DOMAINS
-	bool "Enable Zynq MPSoC generic PM domains"
-	default y
-	depends on PM && ZYNQMP_FIRMWARE
-	select PM_GENERIC_DOMAINS
-	help
-	  Say yes to enable device power management through PM domains
-	  If in doubt, say N.
-
 config XLNX_EVENT_MANAGER
 	bool "Enable Xilinx Event Management Driver"
 	depends on ZYNQMP_FIRMWARE