drm/i915: Decouple intel_fb_bo.h interfaces from driver specific types

Make the intel_fb_bo.h interfaces operated purely in base
drm_ types so that each driver (i915 and xe) doesn't have to
know about each other, or the display stuff.

v2: s/dev/drm/ (Jani)

Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250206185533.32306-4-ville.syrjala@linux.intel.com