drm/i915/display: Move feature test macros to intel_display_device.h

It makes sense to keep the display feature test macros centralized
within the display code.

Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230523195609.73627-7-matthew.d.roper@intel.com