drm/i915/bios: remove stale and useless comments

The comments do not add any value. Remove.

Reviewed-by: Vandita Kulkarni <vandita.kulkarni@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240729173320.1053791-1-jani.nikula@intel.com


Signed-off-by: Jani Nikula <jani.nikula@intel.com>