Send Keystore2 logs to SYSTEM rather than MAIN

Test: Boot on cuttlefish, verify log location
Bug: 215419883
Change-Id: If3cc0a5cec4db576d533c7b5d272845e3604f9d7
diff --git a/keystore2/src/keystore2_main.rs b/keystore2/src/keystore2_main.rs
index bea5f08..5b53ae1 100644
--- a/keystore2/src/keystore2_main.rs
+++ b/keystore2/src/keystore2_main.rs
@@ -44,7 +44,10 @@
 fn main() {
     // Initialize android logging.
     android_logger::init_once(
-        android_logger::Config::default().with_tag("keystore2").with_min_level(log::Level::Debug),
+        android_logger::Config::default()
+            .with_tag("keystore2")
+            .with_min_level(log::Level::Debug)
+            .with_log_id(android_logger::LogId::System),
     );
     // Redirect panic messages to logcat.
     panic::set_hook(Box::new(|panic_info| {