According to feedback received in ZEP-1130, decreasing the stack
size in the prj.mdef file solves the RAM overflow issue reported
by ISSM.
Jira: ZEP-1130
Change-Id: I761531e535a9e54ccd024b397d5d92d7666be817
Signed-off-by: Flavio Santes <flavio.santes@intel.com>