drm/i915: Nuke intel_bios_is_port_dp_dual_mode()

Now that we have encoder->devdata everwhere we don't need
the intel_bios_is_port_dp_dual_mode() wrapper any more.

And while at it let's include it in the child device log
dump as well since the logic in there is a bit more complex
than just DP&&HDMI.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230509160206.25971-3-ville.syrjala@linux.intel.com


Acked-by: Gustavo Sousa <gustavo.sousa@intel.com>