[DO NOT MERGE] - Add transcoding columns to mainline-prod

Add new transcoding columns to mainline-prod. These columns will default
to NULL. Adding these columns now to ensure correctness of database
upgrade and downgrade in the future when the device gets upgraded from
R+ to S.

Bug: 171854824
Test: No-op Changes
Change-Id: I3aa57a6c2ad0aa5134b137244e03ddfc65dc0c4e
1 file changed