Fixes <https://bugs.gnu.org/34162>
Reported by Vagrant Cascadian <vagrant@debian.org>
Note that CRYPTO_CRC32C was already a built-in in our default
configurations for other systems.
* gnu/packages/aux-files/linux-libre/4.20-arm64.conf,
gnu/packages/aux-files/linux-libre/4.19-arm64.conf
(CONFIG_CRYPTO_CRC32C): Change from 'm' to 'y'.