soc: imx: Move power-domain drivers to the genpd dir

To simplify with maintenance let's move the imx power-domain drivers to the
new genpd directory. Going forward, patches are intended to be managed
through a separate git tree, according to MAINTAINERS.

Cc: Shawn Guo <[e-mail]>
Cc: Sascha Hauer <[e-mail]>
Cc: Fabio Estevam <[e-mail]>
Cc: <[e-mail]>
Cc: <[e-mail]>
Reviewed-by: Fabio Estevam <[e-mail]>
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/genpd/imx/Makefile

···
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_HAVE_IMX_GPC) += gpc.o
+obj-$(CONFIG_IMX_GPCV2_PM_DOMAINS) += gpcv2.o
+obj-$(CONFIG_IMX8M_BLK_CTRL) += imx8m-blk-ctrl.o
+obj-$(CONFIG_IMX8M_BLK_CTRL) += imx8mp-blk-ctrl.o
+obj-$(CONFIG_SOC_IMX9) += imx93-pd.o
+obj-$(CONFIG_IMX9_BLK_CTRL) += imx93-blk-ctrl.o

drivers/soc/imx/Makefile

···
 ifeq ($(CONFIG_ARM),y)
 obj-$(CONFIG_ARCH_MXC) += soc-imx.o
 endif
-obj-$(CONFIG_HAVE_IMX_GPC) += gpc.o
-obj-$(CONFIG_IMX_GPCV2_PM_DOMAINS) += gpcv2.o
 obj-$(CONFIG_SOC_IMX8M) += soc-imx8m.o
-obj-$(CONFIG_IMX8M_BLK_CTRL) += imx8m-blk-ctrl.o
-obj-$(CONFIG_IMX8M_BLK_CTRL) += imx8mp-blk-ctrl.o
-obj-$(CONFIG_SOC_IMX9) += imx93-src.o imx93-pd.o
-obj-$(CONFIG_IMX9_BLK_CTRL) += imx93-blk-ctrl.o
+obj-$(CONFIG_SOC_IMX9) += imx93-src.o