[quantal][SRU][PATCH] ALSA: usb: Parse UAC2 extension unit like for UAC1

[Chris J Arges]

BugLink: http://bugs.launchpad.net/bugs/1212430

SRU Justification:

    Impact: Users of the 3.5 kernel may not be able to use their
usbaudio devices.
    Fix: commit 61ac51301e6c6d4ed977d7674ce2b8e713619a9b upstream. This
is already applied to 3.2 and 3.8 kernels via stable updates.
    Testcase: Build with the fix, attach affected usbaudio devices. See
if those devices work after the patch.
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