[Maverick SRU] (pre-stable) Fix mic for Dell Vostro 320

[David Henningsson]

SRU Justification:

Impact: Non-working mic
Fix: Quirk into model "ideapad", tested by cert lab
Testcase: Try recording from mic

Upstream status: Not yet reached Linus's tree, commit id in Takashi's 
tree is 8a96b1e02029aa512199b1b6d281dcede9ed81f1.

Hope I did everything right this time :-)

-- 
David Henningsson, Canonical Ltd.
http://launchpad.net/~diwic
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