Return name of underlaying HW codec

Bug: none
Change-Id: I2c6943b91a6d58b884270a029bcf210e4d5c7a91
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/251782
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Commit-Queue: Sergey Silkin <ssilkin@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#36015}

sdk/android/src/java/org/webrtc/HardwareVideoEncoder.java

@@ -504,7 +504,7 @@ class HardwareVideoEncoder implements VideoEncoder {
 
   @Override
   public String getImplementationName() {
-    return "HWEncoder";
+    return codecName;
   }
 
   @Override