[Intrepid] SRU improve dell-m6 model selection and quirk Studio 17

[Stefan Bader]

https://bugs.launchpad.net/bugs/309512

SRU; justification

Impact: The current code decides based on a PCI SSID whether a given sound 
hardware has a certain hw layout. This list has to be modified each time there 
is a new model. In this specific case the Dell Studio 17 is not recognized 
correctly.

Fix: Applying two patches from upstream: the first enables the user to override 
the hw selection by specifying one of the following values as the model= 
argument to the snd-hda-intel module:
     - dell-m6-amic Dell desktops/laptops with analog mics
     - dell-m6-dmic Dell desktops/laptops with digital mics
     - dell-m6 Dell desktops/laptops with both type of mics
This allows to make new dell-m6 hw to be tested/enabled without the need for a 
new module. The second patch is a simple quirk to automatically select the 
right model for the Studio 17.

Testcase: see bug report.

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