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/evb64260/Makefile b/board/evb64260/Makefile
index 512f6d7..ae2ebed 100644
--- a/board/evb64260/Makefile
+++ b/board/evb64260/Makefile
@@ -8,27 +8,7 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-include $(TOPDIR)/config.mk
-
-LIB	= $(obj)lib$(BOARD).o
-
-SOBJS	= misc.o
-COBJS	= $(BOARD).o flash.o serial.o memory.o pci.o \
+obj-y	= misc.o
+obj-y	+= evb64260.o flash.o serial.o memory.o pci.o \
 	  eth.o eth_addrtbl.o mpsc.o i2c.o \
 	  sdram_init.o zuma_pbb.o intel_flash.o zuma_pbb_mbox.o
-
-SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
-OBJS	:= $(addprefix $(obj),$(COBJS))
-SOBJS	:= $(addprefix $(obj),$(SOBJS))
-
-$(LIB):	$(obj).depend $(OBJS) $(SOBJS)
-	$(call cmd_link_o_target, $(OBJS) $(SOBJS))
-
-#########################################################################
-
-# defines $(obj).depend target
-include $(SRCTREE)/rules.mk
-
-sinclude $(obj).depend
-
-#########################################################################