sound: Re-add Acer C720 support with some adjustments

* Add the Acer C720 infrastructure back in.

* Move the core register programming patch into
gnu/dev/sound/pci/hda/hda_acer_c720_patch.c along

sound: Re-add Acer C720 support with some adjustments

* Add the Acer C720 infrastructure back in.

* Move the core register programming patch into
gnu/dev/sound/pci/hda/hda_acer_c720_patch.c along with the original
GPL copyright from the linux file.

This is the only part of the patch which could reasonably be said to
have been taken from the linux driver.

* The rest of the patch is basically two things.

First, mandatory adjustments to the NID routing to detect
headphone insertion and removal, which was done through trial
an error with my Acer and then verified against the linux driver.

Second, we did include the disabling of the remixer based on a
comment in the linux driver. Basically NID 11 is disabled, two
lines of code, and there's only one way to do that.

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sound: Import latest code from FreeBSD

* As of 1bac48ea8f21c4121f1c45311ec4f05577c58abc (SVN id r275101)
"Add bunch of PCI IDs of Intel Wildcat Point (9 Series) chipsets."

* Do not import isa, ma

sound: Import latest code from FreeBSD

* As of 1bac48ea8f21c4121f1c45311ec4f05577c58abc (SVN id r275101)
"Add bunch of PCI IDs of Intel Wildcat Point (9 Series) chipsets."

* Do not import isa, macio, sbus and usb drivers

* snd_au88x0 has been removed. According to the FreeBSD commit message, it
never even got compiled into the kernel or as a module.

* Drop the ds1, csa and maestro3 drivers due to restrictive license terms
or the need to use binary blobs. These drivers are not built by default
on FreeBSD.

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