Revert "Add a second thread for sensor service."

This reverts commit 0da2531b9fceb7f648103c85794d277e9f466775.

Change-Id: Id356ab9e0b7cf6b2275afc5855e648d322e3bf60
diff --git a/sensors/1.0/default/service.cpp b/sensors/1.0/default/service.cpp
index 65f6d81..5bcfe4b 100644
--- a/sensors/1.0/default/service.cpp
+++ b/sensors/1.0/default/service.cpp
@@ -23,9 +23,5 @@
 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>();
 }