Remap pin 0x16 of ASUS ROG G751 to Headphone

[Håvard <hovardslill@xxxxxxxxx>]

Hi!

On ASUS ROG G751 laptops the heaphone port is mapped to nothing, causing it
to not function at all. I propose that we add a remap of pin 0x16 to
Headphone in order to prevent this issue, and fix compability with the new
mode=asus-g751.

I don't know how to write patches, but this is what needs adding in
sound/pci/hda/patch_realtek.c:

       [ALC668_FIXUP_ASUS_G751_PINS] = {
                .type = HDA_FIXUP_PINS,
                .v.pins = (const struct hda_pintbl[]) {
                        { 0x16, 0x0421101f }, /* HP */
                        {}
                },
        },
        [ALC668_FIXUP_ASUS_G751] = {
                .type = HDA_FIXUP_VERBS,
                .v.verbs = (const struct hda_verb[]) {
                         { 0x20, AC_VERB_SET_COEF_INDEX, 0xc3 },
                         { 0x20, AC_VERB_SET_PROC_COEF, 0x4000 },
                         {}
                },
                .chained = true,
                .chain_id = ALC668_FIXUP_ASUS_G751_PINS
        },

And declaring the function earlier.

-Håvard
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