Configs restructuring

Change-Id: Ib2e98056195cd607f1d3f8b30616b79f445703e9
Remove common audio and media configs

The configs where not identical with the enrc2b ones becaus of manual weaks
and maybe some differences in the stock Sense 4.5.
On Sense 5 the files are identical bewtween the two devices and they also
equal the ones enrc2b was already using.

Change-Id: Ie08be247b0e428d7626c728ba4d9d9f0c1c51b05
Remove common nvram and model_frontal configs

Change-Id: If41db079de943a06f329a25e2f1d5fba7d730ba4