staging: dgap: Simplify to set a concentrator type
It is same manner with setting a board type.
For example of config file for concentrator,
"conc ccon" or
"conc epcon"
After allocating a type of "CNODE" then set a type of concentrator.
So remove cases in swith statement, just get a token from string
and set to "conc.type". And also it doesn't need to "conc.v_type".