Migrate keystore2's Rust system library bindings to bionic.

Bug: 182498247
Test: Build
Change-Id: I1f1bbf4110f36fe6970373c0c51096796ed684ab
diff --git a/microdroid_manager/src/main.rs b/microdroid_manager/src/main.rs
index 1506142..9efa68a 100644
--- a/microdroid_manager/src/main.rs
+++ b/microdroid_manager/src/main.rs
@@ -18,7 +18,6 @@
 mod metadata;
 
 use anyhow::{anyhow, bail, Result};
-use keystore2_system_property::PropertyWatcher;
 use log::{error, info, warn};
 use microdroid_payload_config::{Task, TaskType, VmPayloadConfig};
 use std::fs::{self, File};
@@ -27,6 +26,7 @@
 use std::process::{Command, Stdio};
 use std::str;
 use std::time::Duration;
+use system_properties::PropertyWatcher;
 use vsock::VsockStream;
 
 const WAIT_TIMEOUT: Duration = Duration::from_secs(10);
@@ -40,7 +40,7 @@
         let config = load_config(Path::new(&metadata.payload_config_path))?;
 
         let fake_secret = "This is a placeholder for a value that is derived from the images that are loaded in the VM.";
-        if let Err(err) = keystore2_system_property::write("ro.vmsecret.keymint", fake_secret) {
+        if let Err(err) = system_properties::write("ro.vmsecret.keymint", fake_secret) {
             warn!("failed to set ro.vmsecret.keymint: {}", err);
         }