drm/i915: move dram_info to struct intel_display
With all of dram code under display, also move dram_info to struct
intel_display.
This further cleans up struct xe_device from display related members.
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patch.msgid.link/cbbca93003952ea24ae60e66d79d901dba78ccd8.1763578288.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>