Android EglRenderer: Replace unicoce character with ascii character

We are currently trying to print a nice "μs" to the log, but this often
ends up as a weird character. This CL replaces the unicode 'μ' to a
simple ascii 'u'.

TBR=sakal

Bug: None
Change-Id: Ibe90e0d2f12004676fc531aec0a2b33d59a8cb3f
Reviewed-on: https://webrtc-review.googlesource.com/c/110608
Reviewed-by: Magnus Jedvert <magjed@webrtc.org>
Reviewed-by: Sami Kalliomäki <sakal@webrtc.org>
Commit-Queue: Magnus Jedvert <magjed@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25636}

sdk/android/api/org/webrtc/EglRenderer.java

@@ -702,7 +702,7 @@ public class EglRenderer implements VideoSink {
   }
 
   private String averageTimeAsString(long sumTimeNs, int count) {
-    return (count <= 0) ? "NA" : TimeUnit.NANOSECONDS.toMicros(sumTimeNs / count) + " μs";
+    return (count <= 0) ? "NA" : TimeUnit.NANOSECONDS.toMicros(sumTimeNs / count) + " us";
   }
 
   private void logStatistics() {