fs: convert makefiles to Kbuild style

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/fs/ubifs/Makefile b/fs/ubifs/Makefile
index 47949c1..47d5a8f 100644
--- a/fs/ubifs/Makefile
+++ b/fs/ubifs/Makefile
@@ -9,31 +9,10 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-include $(TOPDIR)/config.mk
-
-LIB	= $(obj)libubifs.o
-
-COBJS-$(CONFIG_CMD_UBIFS) := ubifs.o io.o super.o sb.o master.o lpt.o
-COBJS-$(CONFIG_CMD_UBIFS) += lpt_commit.o scan.o lprops.o
-COBJS-$(CONFIG_CMD_UBIFS) += tnc.o tnc_misc.o debug.o crc16.o budget.o
-COBJS-$(CONFIG_CMD_UBIFS) += log.o orphan.o recovery.o replay.o
-
-SRCS	:= $(AOBJS:.o=.S) $(COBJS-y:.o=.c)
-OBJS	:= $(addprefix $(obj),$(AOBJS) $(COBJS-y))
-
-all:	$(LIB) $(AOBJS)
-
-$(LIB):	$(obj).depend $(OBJS)
-	$(call cmd_link_o_target, $(OBJS))
+obj-$(CONFIG_CMD_UBIFS) := ubifs.o io.o super.o sb.o master.o lpt.o
+obj-$(CONFIG_CMD_UBIFS) += lpt_commit.o scan.o lprops.o
+obj-$(CONFIG_CMD_UBIFS) += tnc.o tnc_misc.o debug.o crc16.o budget.o
+obj-$(CONFIG_CMD_UBIFS) += log.o orphan.o recovery.o replay.o
 
 # SEE README.arm-unaligned-accesses
 $(obj)super.o: CFLAGS += $(PLATFORM_NO_UNALIGNED)
-
-#########################################################################
-
-# defines $(obj).depend target
-include $(SRCTREE)/rules.mk
-
-sinclude $(obj).depend
-
-#########################################################################