Reduce the polling interval in getService() to 100ms

The 1 second polling interval is too long and 100ms interval can reduce
the boot time, especially for ARC++. The test results can be found in
b/30892329.

This CL also adds some ALOGs to show the service start failure as well
as to avoid spam.

Bug: 38432898
Test: Services can still start. Test cheets_PerfBootServer for ARC++.
Change-Id: I9c0da9ef8a18a0e1432c39d98a34377bb66c5d85
diff --git a/libs/binder/Static.cpp b/libs/binder/Static.cpp
index 9899b65..c5c3fd5 100644
--- a/libs/binder/Static.cpp
+++ b/libs/binder/Static.cpp
@@ -97,5 +97,6 @@
 #ifndef __ANDROID_VNDK__
 sp<IPermissionController> gPermissionController;
 #endif
+bool gSystemBootCompleted = false;
 
 }   // namespace android