sunxi: Add AXP_PMIC_BUS kconfig entry

Add simple and meaningful kconfig option for pmic_bus.c
instead of using MACH type on Makefile.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
diff --git a/arch/arm/mach-sunxi/Makefile b/arch/arm/mach-sunxi/Makefile
index 64407db..55df794 100644
--- a/arch/arm/mach-sunxi/Makefile
+++ b/arch/arm/mach-sunxi/Makefile
@@ -18,6 +18,7 @@
 endif
 obj-$(CONFIG_SUN6I_P2WI)	+= p2wi.o
 obj-$(CONFIG_SUN6I_PRCM)	+= prcm.o
+obj-$(CONFIG_AXP_PMIC_BUS)	+= pmic_bus.o
 obj-$(CONFIG_SUN8I_RSB)		+= rsb.o
 obj-$(CONFIG_MACH_SUN4I)	+= clock_sun4i.o
 obj-$(CONFIG_MACH_SUN5I)	+= clock_sun4i.o
@@ -31,12 +32,6 @@
 endif
 obj-$(CONFIG_MACH_SUN9I)	+= clock_sun9i.o gtbus_sun9i.o
 
-obj-$(CONFIG_AXP152_POWER)	+= pmic_bus.o
-obj-$(CONFIG_AXP209_POWER)	+= pmic_bus.o
-obj-$(CONFIG_AXP221_POWER)	+= pmic_bus.o
-obj-$(CONFIG_AXP809_POWER)	+= pmic_bus.o
-obj-$(CONFIG_AXP818_POWER)	+= pmic_bus.o
-
 ifdef CONFIG_SPL_BUILD
 obj-$(CONFIG_MACH_SUN4I)	+= dram_sun4i.o
 obj-$(CONFIG_MACH_SUN5I)	+= dram_sun4i.o