board: arm: convert makefiles to Kbuild style

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>
Cc: Andreas Bießmann <andreas.devel@googlemail.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Prafulla Wadaskar <prafulla@marvell.com>
Cc: Minkyu Kang <mk7.kang@samsung.com>
Cc: Vipin Kumar <vipin.kumar@st.com>
Cc: Tom Warren <twarren@nvidia.com>
Cc: Tom Rini <trini@ti.com>
diff --git a/board/h2200/Makefile b/board/h2200/Makefile
index 26bf144..b654a96 100644
--- a/board/h2200/Makefile
+++ b/board/h2200/Makefile
@@ -6,31 +6,12 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-include $(TOPDIR)/config.mk
+obj-y	:= h2200.o
 
-LIB	= $(obj)lib$(BOARD).o
-
-COBJS	:= h2200.o
-
-SRCS	:= $(COBJS:.o=.c) h2200-header.S
-OBJS	:= $(addprefix $(obj),$(COBJS))
-
-all: $(LIB) $(obj)h2200-header.bin
+extra-y := h2200-header.bin
 
 $(obj)h2200-header.o: h2200-header.S
 	$(CC) $(CFLAGS) -c -o $@ $<
 
 $(obj)h2200-header.bin: $(obj)h2200-header.o
 	$(OBJCOPY) -O binary $< $@
-
-$(LIB):	$(obj).depend $(OBJS)
-	$(call cmd_link_o_target, $(OBJS))
-
-#########################################################################
-
-# defines $(obj).depend target
-include $(SRCTREE)/rules.mk
-
-sinclude $(obj).depend
-
-#########################################################################