Add slow_start_thresholds.sql to get thresholds.

1. Threshold data for different classes of device type, number of cpus or memory size will be added.
2. Methods to fetch thresholds will be expanded to select the appropriate one.

Change-Id: I53060bb0d6baf178ee642605aded661394de4287
diff --git a/Android.bp b/Android.bp
index b689919..c55d11e 100644
--- a/Android.bp
+++ b/Android.bp
@@ -13132,6 +13132,7 @@
         "src/trace_processor/metrics/sql/android/startup/mcycles_per_launch.sql",
         "src/trace_processor/metrics/sql/android/startup/slice_functions.sql",
         "src/trace_processor/metrics/sql/android/startup/slow_start_reasons.sql",
+        "src/trace_processor/metrics/sql/android/startup/slow_start_thresholds.sql",
         "src/trace_processor/metrics/sql/android/startup/system_state.sql",
         "src/trace_processor/metrics/sql/android/startup/thread_state_breakdown.sql",
         "src/trace_processor/metrics/sql/android/sysui_notif_shade_list_builder_metric.sql",