drm/i915/audio: fix audio code enable/disable pipe logging

Need to use pipe_name(pipe) instead of pipe directly.

Fixes: 1f31e35f ("drm/i915/audio: unify audio codec enable/disable debug logging")
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220512161638.272601-1-jani.nikula@intel.com