Removed unused defines from ocstackconfig header file

Removed unused defines from ocstackconfig header file

Since OIC stack now supports Block wise transfer and payload check
is done in CA layer for MAX PDU size, there is no need for max request
and max response variables. MAx Dev address size is defined in cacommon
header file.

Change-Id: I77de6aba4664d8675b559abe4d220a0ce722ff51
Signed-off-by: Sachin Agrawal <sachin.agrawal@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/2430
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Erich Keane <erich.keane@intel.com>
Reviewed-by: Jon A. Cruz <jonc@osg.samsung.com>