fs: convert makefiles to Kbuild style

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/fs/reiserfs/Makefile b/fs/reiserfs/Makefile
index d81d71d..55f70b1 100644
--- a/fs/reiserfs/Makefile
+++ b/fs/reiserfs/Makefile
@@ -9,28 +9,4 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-include $(TOPDIR)/config.mk
-
-LIB	= $(obj)libreiserfs.o
-
-AOBJS	=
-COBJS-$(CONFIG_CMD_REISER) := reiserfs.o dev.o mode_string.o
-
-SRCS	:= $(AOBJS:.o=.S) $(COBJS-y:.o=.c)
-OBJS	:= $(addprefix $(obj),$(AOBJS) $(COBJS-y))
-
-#CPPFLAGS +=
-
-all:	$(LIB) $(AOBJS)
-
-$(LIB):	$(obj).depend $(OBJS)
-	$(call cmd_link_o_target, $(OBJS))
-
-#########################################################################
-
-# defines $(obj).depend target
-include $(SRCTREE)/rules.mk
-
-sinclude $(obj).depend
-
-#########################################################################
+obj-$(CONFIG_CMD_REISER) := reiserfs.o dev.o mode_string.o