power: Refactor Makefile rules

Move the power/ rules into drivers/power to avoid clutter in the Makefile
and drivers/Makefile files.

We must select SPL_POWER if SPL_POWER_DOMAIN is used, since the two are
currently independent and boards do not necessarily enable SPL_POWER.

Add a TPL_POWER as well, as that is used by one board.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index 801b727..f805027 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -3,6 +3,14 @@
 # Copyright (c) 2009 Wind River Systems, Inc.
 # Tom Rix <Tom.Rix at windriver.com>
 
+obj-$(CONFIG_$(SPL_TPL_)ACPI_PMC) += acpi_pmc/
+obj-y += battery/
+obj-$(CONFIG_$(SPL_TPL_)POWER_DOMAIN) += domain/
+obj-y += fuel_gauge/
+obj-y += mfd/
+obj-y += pmic/
+obj-y += regulator/
+
 obj-$(CONFIG_AXP152_POWER)	+= axp152.o
 obj-$(CONFIG_AXP209_POWER)	+= axp209.o
 obj-$(CONFIG_AXP221_POWER)	+= axp221.o