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

To simplify with maintenance let's move the samsung 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: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Cc: Alim Akhtar <alim.akhtar@samsung.com>
Cc: <linux-samsung-soc@vger.kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/genpd/Makefile

@@ -7,3 +7,4 @@ obj-y					+= mediatek/
 obj-y					+= qcom/
 obj-y					+= renesas/
 obj-y					+= rockchip/
+obj-y					+= samsung/

drivers/genpd/samsung/Makefile

+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_EXYNOS_PM_DOMAINS)		+= exynos-pm-domains.o

drivers/soc/samsung/Makefile

@@ -10,7 +10,6 @@ obj-$(CONFIG_EXYNOS_PMU)	+= exynos-pmu.o
 
 obj-$(CONFIG_EXYNOS_PMU_ARM_DRIVERS)	+= exynos3250-pmu.o exynos4-pmu.o \
 					exynos5250-pmu.o exynos5420-pmu.o
-obj-$(CONFIG_EXYNOS_PM_DOMAINS) += pm_domains.o
 obj-$(CONFIG_EXYNOS_REGULATOR_COUPLER) += exynos-regulator-coupler.o
 
 obj-$(CONFIG_SAMSUNG_PM_CHECK)	+= s3c-pm-check.o