gnu: linux-libre@4.4: Update to 4.4.231.

* gnu/packages/linux.scm (linux-libre-4.4-version): Update to 4.4.231.
(linux-libre-4.4-pristine-source): Update hash.
(linux-libre-4.4-source): Remove %linux-libre-fix-atheros-9271-patch.
(deblob-scripts-4.4): Update to 4.4.231.