nds32: convert makefiles to Kbuild style

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Macpaul Lin <macpaul@gmail.com>
diff --git a/board/AndesTech/adp-ag101p/Makefile b/board/AndesTech/adp-ag101p/Makefile
index 875fb92..2ba7da4 100644
--- a/board/AndesTech/adp-ag101p/Makefile
+++ b/board/AndesTech/adp-ag101p/Makefile
@@ -6,23 +6,4 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-include $(TOPDIR)/config.mk
-
-LIB	= $(obj)lib$(BOARD).o
-
-COBJS-y	:= adp-ag101p.o
-
-SRCS	:= $(SOBJS-y:.o=.S) $(COBJS-y:.o=.c)
-OBJS	:= $(addprefix $(obj),$(COBJS-y) $(SOBJS-y))
-
-$(LIB):	$(OBJS)
-	$(call cmd_link_o_target, $(OBJS))
-
-#########################################################################
-
-# defines $(obj).depend target
-include $(SRCTREE)/rules.mk
-
-sinclude $(obj).depend
-
-#########################################################################
+obj-y	:= adp-ag101p.o