Enlarge the test thread stack size, to fix test case fail
in some board which need more stack size for testing, when
CONFIG_EXCEPTION_DEBUG is enabled.
Signed-off-by: Enjia Mai <enjiax.mai@intel.com>
Fix issue #31339 and #31419, test case fail due to access NULL did not
trigger a fatal error in some platform such as nsim_em and iotdk.
Signed-off-by: Enjia Mai <enjiax.mai@intel.com>