MAINTAINERS: add entry for CRC library

I am volunteering to maintain the kernel's CRC library code.

Ard has volunteered to be a reviewer.

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20241202012056.209768-13-ebiggers@kernel.org


Signed-off-by: Eric Biggers <ebiggers@google.com>