Removed Cereal from Build Except where necessary

Removed Cereal from Build Except where necessary

Only 3 file compilations (InProcClientWrapper.cpp, OCResourceRequest.cpp,
and OCRepresentation.cpp) actually need the cereal include, so this fix
removes it from everywhere else.  This will result in faster compile times.

Change-Id: I8f9c7b6c3991089189fe85fd8ebff6a9e1e2aa80
Signed-off-by: Erich Keane <erich.keane@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/300
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Ossama Othman <ossama.othman@intel.com>
Reviewed-by: Patrick Lankswert <patrick.lankswert@intel.com>
Reviewed-by: Sudarshan Prasad <sudarshan.prasad@intel.com>
Reviewed-by: Uze Choi <uzchoi@samsung.com>
Tested-by: Uze Choi <uzchoi@samsung.com>