[Bug target/77494] -mcpu=cortex-a53 does not allow use of crc extensions

[buzz at exotica dot org.uk]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77494

--- Comment #6 from Jools Wills <buzz at exotica dot org.uk> ---
Thanks for the fix - I'll mark the other bug as resolved.