sh: convert makefiles to Kbuild style

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
diff --git a/board/renesas/ap325rxa/Makefile b/board/renesas/ap325rxa/Makefile
index 0597d0f..ff72de9 100644
--- a/board/renesas/ap325rxa/Makefile
+++ b/board/renesas/ap325rxa/Makefile
@@ -8,25 +8,5 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-include $(TOPDIR)/config.mk
-
-LIB	= $(obj)lib$(BOARD).o
-
-COBJS	:= ap325rxa.o cpld-ap325rxa.o
-SOBJS	:= lowlevel_init.o
-
-SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
-OBJS	:= $(addprefix $(obj),$(COBJS))
-SOBJS	:= $(addprefix $(obj),$(SOBJS))
-
-$(LIB):	$(OBJS) $(SOBJS)
-	$(call cmd_link_o_target, $(OBJS) $(SOBJS))
-
-#########################################################################
-
-# defines $(obj).depend target
-include $(SRCTREE)/rules.mk
-
-sinclude $(obj).depend
-
-#########################################################################
+obj-y	:= ap325rxa.o cpld-ap325rxa.o
+obj-y	+= lowlevel_init.o