Enable build process for Arduino Mega on CA Branch for the CI System.

Enable build process for Arduino Mega on CA Branch for the CI System.

I believe this was previously mistakenly disabled. By re-enabling this,
we can ensure that all new commits to the CA Branch are validated
correctly.

Signed-off-by: Joseph Morrow <joseph.l.morrow@intel.com>
Change-Id: Icc882206bc3e2b8dc8dd5955bfa518e361f95b2b
Reviewed-on: https://gerrit.iotivity.org/gerrit/527
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Sachin Agrawal <sachin.agrawal@intel.com>
Reviewed-by: Erich Keane <erich.keane@intel.com>