drm/vc4: hdmi: Add jack detection to HDMI audio driver

Add ALSA jack detection to the vc4-hdmi audio driver so userspace knows
when to add/remove HDMI audio devices.

Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: David Turner <david.turner@raspberrypi.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250317-vc4_hotplug-v4-3-2af625629186@raspberrypi.com


Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>