drm/nouveau: Add HD-audio component notifier support

This patch adds the support for the notification of HD-audio hotplug
via the already existing drm_audio_component framework.  This allows
us more reliable hotplug notification and ELD transfer without
accessing HD-audio bus; it's more efficient, and more importantly, it
works without waking up the runtime PM.

The implementation is rather simplistic: nouveau driver provides the
get_eld ops for HD-audio, and it notifies the audio hotplug via
pin_eld_notify callback upon each nv50_audio_enable() and _disable()
call.  As the HD-audio pin assignment seems corresponding to the CRTC,
the crtc->index number is passed directly as the zero-based port
number.

The bind and unbind callbacks handle the device-link so that it
assures the PM call order.

Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Lyude Paul <[email protected]>
Cc: Jaroslav Kysela <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>
Signed-off-by: Ben Skeggs <[email protected]>

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