drivers: convert makefiles to Kbuild style

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/drivers/power/pmic/Makefile b/drivers/power/pmic/Makefile
index 11b3d03..0b45ffa 100644
--- a/drivers/power/pmic/Makefile
+++ b/drivers/power/pmic/Makefile
@@ -5,32 +5,9 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-include $(TOPDIR)/config.mk
-
-LIB	:= $(obj)libpmic.o
-
-COBJS-$(CONFIG_POWER_MAX8998) += pmic_max8998.o
-COBJS-$(CONFIG_POWER_MAX8997) += pmic_max8997.o
-COBJS-$(CONFIG_POWER_MUIC_MAX8997) += muic_max8997.o
-COBJS-$(CONFIG_POWER_MAX77686) += pmic_max77686.o
-COBJS-$(CONFIG_POWER_TPS65217) += pmic_tps65217.o
-COBJS-$(CONFIG_POWER_TPS65910) += pmic_tps65910.o
-
-COBJS	:= $(COBJS-y)
-SRCS	:= $(COBJS:.o=.c)
-OBJS	:= $(addprefix $(obj),$(COBJS))
-
-all:	$(LIB)
-
-$(LIB):	$(obj).depend $(OBJS)
-	$(call cmd_link_o_target, $(OBJS))
-
-
-#########################################################################
-
-# defines $(obj).depend target
-include $(SRCTREE)/rules.mk
-
-sinclude $(obj).depend
-
-########################################################################
+obj-$(CONFIG_POWER_MAX8998) += pmic_max8998.o
+obj-$(CONFIG_POWER_MAX8997) += pmic_max8997.o
+obj-$(CONFIG_POWER_MUIC_MAX8997) += muic_max8997.o
+obj-$(CONFIG_POWER_MAX77686) += pmic_max77686.o
+obj-$(CONFIG_POWER_TPS65217) += pmic_tps65217.o
+obj-$(CONFIG_POWER_TPS65910) += pmic_tps65910.o