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/Marvell/db64360/Makefile b/board/Marvell/db64360/Makefile
index a5f2c54..aad4776 100644
--- a/board/Marvell/db64360/Makefile
+++ b/board/Marvell/db64360/Makefile
@@ -8,31 +8,10 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-include $(TOPDIR)/config.mk
 ifneq ($(OBJTREE),$(SRCTREE))
 $(shell mkdir -p $(obj)../common)
 endif
 
-LIB	= $(obj)lib$(BOARD).o
-
-SOBJS	= ../common/misc.o
-
-COBJS	= $(BOARD).o ../common/flash.o ../common/serial.o ../common/memory.o pci.o \
+obj-y	= db64360.o ../common/flash.o ../common/serial.o ../common/memory.o pci.o \
 	  mv_eth.o ../common/ns16550.o mpsc.o ../common/i2c.o \
-	  sdram_init.o ../common/intel_flash.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
-
-#########################################################################
+	  sdram_init.o ../common/intel_flash.o ../common/misc.o
diff --git a/board/Marvell/db64460/Makefile b/board/Marvell/db64460/Makefile
index a5f2c54..ea9e570 100644
--- a/board/Marvell/db64460/Makefile
+++ b/board/Marvell/db64460/Makefile
@@ -8,31 +8,10 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-include $(TOPDIR)/config.mk
 ifneq ($(OBJTREE),$(SRCTREE))
 $(shell mkdir -p $(obj)../common)
 endif
 
-LIB	= $(obj)lib$(BOARD).o
-
-SOBJS	= ../common/misc.o
-
-COBJS	= $(BOARD).o ../common/flash.o ../common/serial.o ../common/memory.o pci.o \
+obj-y	+= db64460.o ../common/flash.o ../common/serial.o ../common/memory.o pci.o \
 	  mv_eth.o ../common/ns16550.o mpsc.o ../common/i2c.o \
-	  sdram_init.o ../common/intel_flash.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
-
-#########################################################################
+	  sdram_init.o ../common/intel_flash.o ../common/misc.o