Stop using kernel logger

Use the default logger, which is set to /dev/hvc2 for Microdroid.

Bug: 270566364
Test: vm/vm_shell.sh start-microdroid  -- --protected --console \
/data/local/tmp/console.txt --log /data/local/tmp/log.txt

Check that all logs (except for those from init and kernel) are in
log.txt.

Change-Id: Iaea1ca07ff02d4beb728916844f95774f5d2cd85
diff --git a/microdroid_manager/src/main.rs b/microdroid_manager/src/main.rs
index 8fa2807..9c19feb 100644
--- a/microdroid_manager/src/main.rs
+++ b/microdroid_manager/src/main.rs
@@ -211,7 +211,11 @@
 }
 
 fn try_main() -> Result<()> {
-    let _ignored = kernlog::init();
+    android_logger::init_once(
+        android_logger::Config::default()
+            .with_tag("microdroid_manager")
+            .with_min_level(log::Level::Info),
+    );
     info!("started.");
 
     // SAFETY: This is the only place we take the ownership of the fd of the vm payload service.