update linux kernel and bootloader build shell script

guowenxue

2021-11-25 d15f444cb9b5d3c1a2b102bbe0f3ba5916f239f1

 tools/lintools/buildroot/buildroot.sh

@@ -112,7 +112,10 @@
        exit ;
    fi

    echo ""
    echo ""
    echo " Switch work space to \"$WORK_SPACE\" " 
    echo ""
    mkdir -p $WORK_SPACE 
    cd $WORK_SPACE
}