armv7: convert makefiles to Kbuild style

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/arch/arm/cpu/armv7/omap3/Makefile b/arch/arm/cpu/armv7/omap3/Makefile
index f070c18..39ff257 100644
--- a/arch/arm/cpu/armv7/omap3/Makefile
+++ b/arch/arm/cpu/armv7/omap3/Makefile
@@ -5,38 +5,17 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-include $(TOPDIR)/config.mk
+obj-y	:= lowlevel_init.o
 
-LIB	=  $(obj)lib$(SOC).o
-
-SOBJS	:= lowlevel_init.o
-
-COBJS	+= board.o
-COBJS	+= clock.o
-COBJS	+= mem.o
-COBJS	+= sys_info.o
+obj-y	+= board.o
+obj-y	+= clock.o
+obj-y	+= mem.o
+obj-y	+= sys_info.o
 ifdef CONFIG_SPL_BUILD
-COBJS-$(CONFIG_SPL_OMAP3_ID_NAND)	+= spl_id_nand.o
+obj-$(CONFIG_SPL_OMAP3_ID_NAND)	+= spl_id_nand.o
 endif
 
-COBJS-$(CONFIG_DRIVER_TI_EMAC)	+= emac.o
-COBJS-$(CONFIG_EMIF4)	+= emif4.o
-COBJS-$(CONFIG_SDRC)	+= sdrc.o
-COBJS-$(CONFIG_USB_MUSB_AM35X)	+= am35x_musb.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))
-
-#########################################################################
-
-# defines $(obj).depend target
-include $(SRCTREE)/rules.mk
-
-sinclude $(obj).depend
-
-#########################################################################
+obj-$(CONFIG_DRIVER_TI_EMAC)	+= emac.o
+obj-$(CONFIG_EMIF4)	+= emif4.o
+obj-$(CONFIG_SDRC)	+= sdrc.o
+obj-$(CONFIG_USB_MUSB_AM35X)	+= am35x_musb.o