Revert "Add a second thread for sensor service."

using android::hardware::defaultPassthroughServiceImplementation;

int main() {

    /* Sensors framework service needs at least two threads.

     * One thread blocks on a "poll"

     * The second thread is needed for all other HAL methods.

     */

    return defaultPassthroughServiceImplementation<ISensors>(2);

    return defaultPassthroughServiceImplementation<ISensors>();

}