Use fully-qualified names instead of read and write.

This one's for you, Paul!

Test: Build
Change-Id: I44d0c05427a897e7d3d35ae2c8b9aa952920e661
diff --git a/keystore2/src/metrics_store.rs b/keystore2/src/metrics_store.rs
index 564ab66..4634da1 100644
--- a/keystore2/src/metrics_store.rs
+++ b/keystore2/src/metrics_store.rs
@@ -49,7 +49,7 @@
 use std::collections::HashMap;
 use std::sync::Mutex;
 use std::time::{Duration, SystemTime, UNIX_EPOCH};
-use system_properties::{read, write, PropertyWatcherError};
+use system_properties::PropertyWatcherError;
 
 // Note: Crash events are recorded at keystore restarts, based on the assumption that keystore only
 // gets restarted after a crash, during a boot cycle.
@@ -626,7 +626,8 @@
         }
     };
 
-    if let Err(e) = write(KEYSTORE_CRASH_COUNT_PROPERTY, &new_count.to_string()) {
+    if let Err(e) = system_properties::write(KEYSTORE_CRASH_COUNT_PROPERTY, &new_count.to_string())
+    {
         log::error!(
             concat!(
                 "In update_keystore_crash_sysprop:: ",
@@ -639,7 +640,7 @@
 
 /// Read the system property: keystore.crash_count.
 pub fn read_keystore_crash_count() -> Result<i32> {
-    read("keystore.crash_count")
+    system_properties::read("keystore.crash_count")
         .context("In read_keystore_crash_count: Failed read property.")?
         .parse::<i32>()
         .map_err(std::convert::Into::into)