This is a followup to commit 4845dee706.
* gnu/packages/aux-files/linux-libre/5.2-arm-veyron.conf,
gnu/packages/aux-files/linux-libre/5.2-arm.conf,
gnu/packages/aux-files/linux-libre/5.2-arm64.conf,
gnu/packages/aux-files/linux-libre/5.2-i686.conf,
gnu/packages/aux-files/linux-libre/5.2-x86_64.conf: Delete files.
* Makefile.am (AUX_FILES): Remove them.