mips: convert makefiles to Kbuild style

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Daniel Schwierzeck <daniel.schwierzeck@googlemail.com>
diff --git a/arch/mips/lib/Makefile b/arch/mips/lib/Makefile
index f91406c..3705926 100644
--- a/arch/mips/lib/Makefile
+++ b/arch/mips/lib/Makefile
@@ -5,46 +5,12 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-include $(TOPDIR)/config.mk
-
-LIB	= $(obj)lib$(ARCH).o
-
-## Build a couple of necessary functions into a private libgcc
-LIBGCC	= $(obj)libgcc.o
-GLSOBJS	+= ashldi3.o
-GLSOBJS	+= ashrdi3.o
-GLSOBJS	+= lshrdi3.o
-LGOBJS	:= $(addprefix $(obj),$(GLSOBJS))
-
-SOBJS-y	+=
-
-COBJS-y	+= board.o
-COBJS-$(CONFIG_CMD_BOOTM) += bootm.o
-
-SRCS	:= $(SOBJS-y:.o=.S) $(COBJS-y:.o=.c)
-OBJS	:= $(addprefix $(obj),$(SOBJS-y) $(COBJS-y))
-
-# Always build libmips.o
-TARGETS	:= $(LIB)
+obj-y	+= board.o
+obj-$(CONFIG_CMD_BOOTM) += bootm.o
 
 # Build private libgcc only when asked for
 ifdef USE_PRIVATE_LIBGCC
-TARGETS	+= $(LIBGCC)
+lib-y	+= ashldi3.o
+lib-y	+= ashrdi3.o
+lib-y	+= lshrdi3.o
 endif
-
-all:	$(TARGETS)
-
-$(LIB):	$(obj).depend $(OBJS)
-	$(call cmd_link_o_target, $(OBJS))
-
-$(LIBGCC): $(obj).depend $(LGOBJS)
-	$(call cmd_link_o_target, $(LGOBJS))
-
-#########################################################################
-
-# defines $(obj).depend target
-include $(SRCTREE)/rules.mk
-
-sinclude $(obj).depend
-
-#########################################################################