Replace use of __CONCAT with _OFP_CONCAT
Replace use of __CONCAT with _OFP_CONCAT

Add _OFP prefix to avoid collision with non-OFP definition.

Signed-off-by: Ola Liljedahl <6d19e6e0076f8797cfccb58ffb99074265221b72@arm.com>
Reviewed-by: Jere Leppänen <14957520de8d9815e0c353a07fe23c737f0171e9@nokia.com>

OpenFastPath/ofp,OpenFastPath/ofp,OpenFastPath/ofp,OpenFastPath/ofp