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/packet.cc b/modules/video_coding/packet.cc
index b50e975..1113a6d 100644
--- a/modules/video_coding/packet.cc
+++ b/modules/video_coding/packet.cc
@@ -46,7 +46,7 @@
                      size_t size,
                      const RTPHeader& rtp_header,
                      const RTPVideoHeader& videoHeader,
-                     FrameType frame_type,
+                     VideoFrameType frame_type,
                      int64_t ntp_time_ms)
     : payloadType(rtp_header.payloadType),
       timestamp(rtp_header.timestamp),