Reenables several NetEq unittests on android.

Several unittests were disabled on android, this CL will reenable them. One of
the tests was accidentally disabled on all platforms, and now no longer gives a
bitexact result.

BUG=webrtc:3343,webrtc:5349

Review URL: https://codereview.webrtc.org/1532903002

Cr-Commit-Position: refs/heads/master@{#11323}
diff --git a/webrtc/test/testsupport/fileutils.cc b/webrtc/test/testsupport/fileutils.cc
index 15abf5c..4ff0034 100644
--- a/webrtc/test/testsupport/fileutils.cc
+++ b/webrtc/test/testsupport/fileutils.cc
@@ -222,6 +222,9 @@
 #ifdef WEBRTC_MAC
   platform = "mac";
 #endif  // WEBRTC_MAC
+#ifdef WEBRTC_ANDROID
+  platform = "android";
+#endif  // WEBRTC_ANDROID
 
 #ifdef WEBRTC_ARCH_64_BITS
   std::string architecture = "64";