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/cpci750/Makefile b/board/esd/cpci750/Makefile
index 0be10fe..8b3dc33 100644
--- a/board/esd/cpci750/Makefile
+++ b/board/esd/cpci750/Makefile
@@ -8,31 +8,11 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-include $(TOPDIR)/config.mk
 ifneq ($(OBJTREE),$(SRCTREE))
 $(shell mkdir -p $(obj)../../Marvell/common)
 endif
 
-LIB	= $(obj)lib$(BOARD).o
-
-SOBJS	= misc.o
-
-COBJS	= $(BOARD).o serial.o ../../Marvell/common/memory.o pci.o \
+obj-y	= misc.o
+obj-y	+= cpci750.o serial.o ../../Marvell/common/memory.o pci.o \
 	  mv_eth.o  mpsc.o i2c.o \
 	  sdram_init.o ide.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
-
-#########################################################################