armv7: convert makefiles to Kbuild style

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/arch/arm/cpu/armv7/am33xx/Makefile b/arch/arm/cpu/armv7/am33xx/Makefile
index f6a297c..966fcab 100644
--- a/arch/arm/cpu/armv7/am33xx/Makefile
+++ b/arch/arm/cpu/armv7/am33xx/Makefile
@@ -4,46 +4,19 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-include $(TOPDIR)/config.mk
-
-LIB	= $(obj)lib$(SOC).o
-
-COBJS-$(CONFIG_AM33XX)	+= clock_am33xx.o
-COBJS-$(CONFIG_TI814X)	+= clock_ti814x.o
-COBJS-$(CONFIG_AM43XX)	+= clock_am43xx.o
+obj-$(CONFIG_AM33XX)	+= clock_am33xx.o
+obj-$(CONFIG_TI814X)	+= clock_ti814x.o
+obj-$(CONFIG_AM43XX)	+= clock_am43xx.o
 
 ifneq ($(CONFIG_AM43XX)$(CONFIG_AM33XX),)
-COBJS	+= clock.o
+obj-y	+= clock.o
 endif
 
-COBJS-$(CONFIG_TI816X)	+= clock_ti816x.o
-COBJS	+= sys_info.o
-COBJS	+= mem.o
-COBJS	+= ddr.o
-COBJS	+= emif4.o
-COBJS	+= board.o
-COBJS	+= mux.o
-COBJS-$(CONFIG_NAND_OMAP_GPMC)	+= elm.o
-
-SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
-OBJS	:= $(addprefix $(obj),$(COBJS) $(COBJS-y) $(SOBJS))
-
-all:	$(obj).depend $(LIB)
-
-$(LIB):	$(OBJS)
-	$(call cmd_link_o_target, $(OBJS))
-
-clean:
-	rm -f $(SOBJS) $(OBJS)
-
-distclean:	clean
-	rm -f $(LIB) core *.bak .depend
-
-#########################################################################
-
-# defines $(obj).depend target
-include $(SRCTREE)/rules.mk
-
-sinclude $(obj).depend
-
-#########################################################################
+obj-$(CONFIG_TI816X)	+= clock_ti816x.o
+obj-y	+= sys_info.o
+obj-y	+= mem.o
+obj-y	+= ddr.o
+obj-y	+= emif4.o
+obj-y	+= board.o
+obj-y	+= mux.o
+obj-$(CONFIG_NAND_OMAP_GPMC)	+= elm.o