drm/i915/bios: remove duplicated code

Apparently caused by a merge fail at some point. Due to the nature of
the duplicated block, the second one will have no effect, and there's no
need to backport.

Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180410091248.1454-1-jani.nikula@intel.com