fs: convert makefiles to Kbuild style

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/fs/jffs2/Makefile b/fs/jffs2/Makefile
index a11ca32..02e481f 100644
--- a/fs/jffs2/Makefile
+++ b/fs/jffs2/Makefile
@@ -5,37 +5,11 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-include $(TOPDIR)/config.mk
-
-LIB	= $(obj)libjffs2.o
-
-AOBJS	=
 ifdef CONFIG_CMD_JFFS2
-COBJS-$(CONFIG_JFFS2_LZO) += compr_lzo.o
-COBJS-y += compr_rtime.o
-COBJS-y += compr_rubin.o
-COBJS-y += compr_zlib.o
-COBJS-y += jffs2_1pass.o
-COBJS-y += mini_inflate.o
+obj-$(CONFIG_JFFS2_LZO) += compr_lzo.o
+obj-y += compr_rtime.o
+obj-y += compr_rubin.o
+obj-y += compr_zlib.o
+obj-y += jffs2_1pass.o
+obj-y += mini_inflate.o
 endif
-
-COBJS	:= $(COBJS-y)
-SRCS	:= $(AOBJS:.o=.S) $(COBJS:.o=.c)
-OBJS	:= $(addprefix $(obj),$(AOBJS) $(COBJS))
-
-#CPPFLAGS +=
-
-all:	$(LIB) $(AOBJS)
-
-$(LIB):	$(obj).depend $(OBJS)
-	$(call cmd_link_o_target, $(OBJS))
-
-
-#########################################################################
-
-# defines $(obj).depend target
-include $(SRCTREE)/rules.mk
-
-sinclude $(obj).depend
-
-#########################################################################