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/esd/pf5200/Makefile b/board/esd/pf5200/Makefile
index 121f772..24abbaf 100644
--- a/board/esd/pf5200/Makefile
+++ b/board/esd/pf5200/Makefile
@@ -6,33 +6,14 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-include $(TOPDIR)/config.mk
 # ifneq ($(OBJTREE),$(SRCTREE))
 # $(shell mkdir -p $(obj)../common/xilinx_jtag)
 # endif
 
-LIB	= $(obj)lib$(BOARD).o
-
 # Objects for Xilinx JTAG programming (CPLD)
 # CPLD  = ../common/xilinx_jtag/lenval.o \
 #	  ../common/xilinx_jtag/micro.o \
 #	  ../common/xilinx_jtag/ports.o
 
-# COBJS	= $(BOARD).o flash.o $(CPLD)
-COBJS	= $(BOARD).o flash.o
-
-SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
-OBJS	:= $(addprefix $(obj),$(COBJS))
-SOBJS	:= $(addprefix $(obj),$(SOBJS))
-
-$(LIB):	$(obj).depend $(OBJS)
-	$(call cmd_link_o_target, $(OBJS))
-
-#########################################################################
-
-# defines $(obj).depend target
-include $(SRCTREE)/rules.mk
-
-sinclude $(obj).depend
-
-#########################################################################
+# obj-y	= pf5200.o flash.o $(CPLD)
+obj-y	= pf5200.o flash.o