Prepare for splitting FrameType into AudioFrameType and VideoFrameType

This cl deprecates the FrameType enum, and adds aliases AudioFrameType
and VideoFrameType.

After downstream usage is updated, the enums will be separated
and be moved out of common_types.h.

Bug: webrtc:6883
Change-Id: I2aaf660169da45f22574b4cbb16aea8522cc07a6
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/123184
Commit-Queue: Niels Moller <nisse@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27011}
diff --git a/modules/video_coding/receiver_unittest.cc b/modules/video_coding/receiver_unittest.cc
index ca50dfa..29bb209 100644
--- a/modules/video_coding/receiver_unittest.cc
+++ b/modules/video_coding/receiver_unittest.cc
@@ -56,7 +56,7 @@
     return receiver_.InsertPacket(packet);
   }
 
-  int32_t InsertFrame(FrameType frame_type, bool complete) {
+  int32_t InsertFrame(VideoFrameType frame_type, bool complete) {
     int num_of_packets = complete ? 1 : 2;
     stream_generator_->GenerateFrame(
         frame_type, (frame_type != kEmptyFrame) ? num_of_packets : 0,
@@ -322,7 +322,7 @@
 
   void GenerateAndInsertFrame(int64_t render_timestamp_ms) {
     VCMPacket packet;
-    stream_generator_->GenerateFrame(FrameType::kVideoFrameKey,
+    stream_generator_->GenerateFrame(VideoFrameType::kVideoFrameKey,
                                      1,  // media packets
                                      0,  // empty packets
                                      render_timestamp_ms);