pcm/alsa: package pcm's DataSize function shouldn't include adpcm

[Trek Hopton]

pcm package’s DataSize function shouldn’t include ADPCM since it’s a different codec. The alsa package’s DataSize function should do the check to see if ADPCM size needs to be calculated. This makes the code more safe too since the alsa package can have control over setting the codec parameter correctly.

[Trek Hopton]

Resolved in PR #441