Enabling sharding RunSettingsRoboTests

Also fixed failed test cases caused by running
RunSettingsRoboTests with the sharding mechanism.

Bug: 130895860
Test: make RunSettingsRoboTests -j40
Change-Id: I0e5e0764d4ea910b9c0acc693d63a4b793e23d3a
diff --git a/tests/robotests/Android.bp b/tests/robotests/Android.bp
index 28c987b..4920e11 100644
--- a/tests/robotests/Android.bp
+++ b/tests/robotests/Android.bp
@@ -67,6 +67,7 @@
 
     test_options: {
         timeout: 36000,
+        shards: 10,
     },
 
     coverage_libs: [