api: Don't check for MTRIE preprocessor macro in API headers.
api: Don't check for MTRIE preprocessor macro in API headers.

Eliminate usage of MTRIE macro in the API headers, so that the
application doesn't need to define it.

Signed-off-by: Jere Leppänen <14957520de8d9815e0c353a07fe23c737f0171e9@nokia.com>
Reviewed-by: Sorin Vultureanu <8013ba55f8675034bc2ab0d6c3a1c9650437ca36@enea.com>

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