latona: update media_codecs.xml for 4.3

* Add GSM decoder explicity
* Add VPX encoder (now required for 4.3 compatibility)

Cherry-picked 4250bbb4b20b408cd589dbf76055c1366269ce30 from aries-common repo.

Signed-off-by: Pawit Pornkitprasan <p.pawit@gmail.com>
Signed-off-by: David Rodero <david@codiguiel.net>

Conflicts:
	media_codecs.xml

Change-Id: I2dd0e57419bac1de68b99476ba102ce43c8cc583