Add make_defconfig script

tools for save defconfig
$ ./make_defconfig.sh mako-perf_defconfig
it will update in arch/arm/configs

Change-Id: Ic4946b4ac020faf7026bde216b480994ff9a71a8

make_defconfig.sh

+#!/bin/bash
+
+DEFCONFIG_FILE=$1
+
+if [ -z "$DEFCONFIG_FILE" ]; then
+	echo "Need defconfig file(j1v-perf_defconfig)!"
+	exit -1
+fi
+
+if [ ! -e arch/arm/configs/$DEFCONFIG_FILE ]; then
+	echo "No such file : arch/arm/configs/$DEFCONFIG_FILE"
+	exit -1
+fi
+
+# make .config
+env KCONFIG_NOTIMESTAMP=true \
+make ARCH=arm CROSS_COMPILE=arm-eabi- ${DEFCONFIG_FILE}
+
+# run menuconfig
+env KCONFIG_NOTIMESTAMP=true \
+make menuconfig ARCH=arm
+
+make savedefconfig ARCH=arm
+# copy .config to defconfig
+mv defconfig arch/arm/configs/${DEFCONFIG_FILE}
+# clean kernel object
+make mrproper