Rename metrics.proto to wv_metrics.proto.

Merge from http://go/wvgerrit/105767

To avoid conflict with metrics.proto in
frameworks/av/drm/libmediadrm/proto.
This is in preparation of moving metrics_dump tool
to build under Android.

bug: 161783052
Test: unit test
Test: Play Movies & Tv and Netflix streaming
Change-Id: I2406b66db4d61cca7c6260ea8847a555d96c8d42

libwvdrmengine/cdm/metrics/src/Android.bp

@@ -4,7 +4,7 @@ cc_library {
     vendor: true,
 
     srcs: [
-      "metrics.proto",
+      "wv_metrics.proto",
     ],
 
     cflags: [