stdlib: split linux.cpu.idle into linux.cpu.idle_stats

This reduces runtime of linux.cpu.idle where the stats are not needed.

Change-Id: I506c718ab2a64dba5817ad2793540abf5dfa0e10
diff --git a/Android.bp b/Android.bp
index 4cc0adf..a89a992 100644
--- a/Android.bp
+++ b/Android.bp
@@ -13333,6 +13333,7 @@
         "src/trace_processor/perfetto_sql/stdlib/intervals/overlap.sql",
         "src/trace_processor/perfetto_sql/stdlib/linux/cpu/frequency.sql",
         "src/trace_processor/perfetto_sql/stdlib/linux/cpu/idle.sql",
+        "src/trace_processor/perfetto_sql/stdlib/linux/cpu/idle_stats.sql",
         "src/trace_processor/perfetto_sql/stdlib/linux/cpu/utilization/general.sql",
         "src/trace_processor/perfetto_sql/stdlib/linux/cpu/utilization/process.sql",
         "src/trace_processor/perfetto_sql/stdlib/linux/cpu/utilization/system.sql",