soc: apple: Move power-domain driver to the genpd dir

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

Cc: Hector Martin <marcan@marcan.st>
Cc: Sven Peter <sven@svenpeter.dev>
Cc: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Cc: <asahi@lists.linux.dev>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

MAINTAINERS

@@ -1904,6 +1904,7 @@ F:	drivers/bluetooth/hci_bcm4377.c
 F:	drivers/clk/clk-apple-nco.c
 F:	drivers/cpufreq/apple-soc-cpufreq.c
 F:	drivers/dma/apple-admac.c
+F:	drivers/genpd/apple/
 F:	drivers/i2c/busses/i2c-pasemi-core.c
 F:	drivers/i2c/busses/i2c-pasemi-platform.c
 F:	drivers/iommu/apple-dart.c

drivers/genpd/Makefile

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

drivers/genpd/apple/Makefile

+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_APPLE_PMGR_PWRSTATE)	+= pmgr-pwrstate.o

drivers/soc/apple/Makefile

 # SPDX-License-Identifier: GPL-2.0-only
-obj-$(CONFIG_APPLE_PMGR_PWRSTATE)	+= apple-pmgr-pwrstate.o
-
 obj-$(CONFIG_APPLE_RTKIT) += apple-rtkit.o
 apple-rtkit-y = rtkit.o rtkit-crashlog.o