drm/i915/dp: Reprobe connector if getting/acking link service IRQs fails

drm/i915/dp: Reprobe connector if getting/acking link service IRQs fails

An AUX access failure during HPD IRQ handling should be handled by
falling back to a full connector detection, ensure that if the failure
happens while reading/acking a link service IRQ.

While at it add code comment documenting the return value of
intel_dp_check_link_service_irq().

v2: Docuement intel_dp_check_link_service_irq()'s return value. (Jani)

Cc: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260225164618.1261368-13-imre.deak@intel.com