Comment 49 for bug 893402

Based on http://www.ti.com/pdfs/wtbu/OMAP4430_4460_4470_PUBLIC_TRM_Addendum_ABE_HAL_vF.pdf each ABE port have "asynchronous sample-rate converters."
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The ports are exchanging 8 to 32bits data MSB aligned on a 32bits container. MM_DL allows
receiving two concatenated 16bits Left/Right samples per 32bits accesses.
The sampling rate is 48kHz. Voice paths use 8 or 16kHz. MM_DL use 44.1kHz or 48kHz.

The sampling rate of MM_DL and voice ports can be adjusted with 1ppm accuracy using the
asynchronous sample-rate converters.
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