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

To simplify with maintenance let's move the amlogic 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: Neil Armstrong <[e-mail]>
Cc: Kevin Hilman <[e-mail]>
Cc: Jerome Brunet <[e-mail]>
Cc: Martin Blumenstingl <[e-mail]>
Cc: <[e-mail]>
Acked-by: Neil Armstrong <[e-mail]>
Signed-off-by: Ulf Hansson <[e-mail]>

MAINTAINERS

···
 F:	arch/arm/boot/dts/amlogic/
 F:	arch/arm/mach-meson/
 F:	arch/arm64/boot/dts/amlogic/
+F:	drivers/genpd/amlogic/
 F:	drivers/mmc/host/meson*
 F:	drivers/phy/amlogic/
 F:	drivers/pinctrl/meson/

drivers/genpd/Makefile

···
 # SPDX-License-Identifier: GPL-2.0-only
 obj-y					+= actions/
+obj-y					+= amlogic/

drivers/genpd/amlogic/Makefile

···
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_MESON_GX_PM_DOMAINS) += meson-gx-pwrc-vpu.o
+obj-$(CONFIG_MESON_EE_PM_DOMAINS) += meson-ee-pwrc.o
+obj-$(CONFIG_MESON_SECURE_PM_DOMAINS) += meson-secure-pwrc.o

drivers/soc/amlogic/Makefile

···
 obj-$(CONFIG_MESON_CANVAS) += meson-canvas.o
 obj-$(CONFIG_MESON_CLK_MEASURE) += meson-clk-measure.o
 obj-$(CONFIG_MESON_GX_SOCINFO) += meson-gx-socinfo.o
-obj-$(CONFIG_MESON_GX_PM_DOMAINS) += meson-gx-pwrc-vpu.o
 obj-$(CONFIG_MESON_MX_SOCINFO) += meson-mx-socinfo.o
-obj-$(CONFIG_MESON_EE_PM_DOMAINS) += meson-ee-pwrc.o
-obj-$(CONFIG_MESON_SECURE_PM_DOMAINS) += meson-secure-pwrc.o