tests: syscalls: Reduce sleep time on Intel audio DSP simulators

Reduce the sleep time in the torture test for Intel audio DSP
simulator. The current amount of time makes this test to take
a long long time to finish causing problems on CI.

Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
Signed-off-by: Daniel Leung <daniel.leung@intel.com>