board: powerpc: convert makefiles to Kbuild style

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Kim Phillips <kim.phillips@freescale.com>
Cc: York Sun <yorksun@freescale.com>
Cc: Stefan Roese <sr@denx.de>
diff --git a/board/gdsys/405ep/Makefile b/board/gdsys/405ep/Makefile
index 81d23c5..857ec04 100644
--- a/board/gdsys/405ep/Makefile
+++ b/board/gdsys/405ep/Makefile
@@ -5,30 +5,8 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-include $(TOPDIR)/config.mk
-
-LIB	= $(obj)lib$(BOARD).o
-
-COBJS-$(CONFIG_NEO) += neo.o
-COBJS-$(CONFIG_IO) += io.o
-COBJS-$(CONFIG_IOCON) += iocon.o
-COBJS-$(CONFIG_DLVISION_10G) += dlvision-10g.o
-
-COBJS   := $(BOARD).o $(COBJS-y)
-SOBJS   =
-
-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 $(obj).depend
-
-#########################################################################
+obj-y := 405ep.o
+obj-$(CONFIG_NEO) += neo.o
+obj-$(CONFIG_IO) += io.o
+obj-$(CONFIG_IOCON) += iocon.o
+obj-$(CONFIG_DLVISION_10G) += dlvision-10g.o