security/gnutls: unbreak aarch64 after r431214

lib/accelerated/aarch64/elf/aes-aarch64.s.tmp.S:5:1: error: unknown directive
.arch armv8-a+crypto
^
lib/accelerated/aarch64/elf/aes-aarch64.s.tmp.S:49:2: error: instruction requires: crypto
aese v6.16b,v0.16b
^

PR: 216045
Approved by: tijl (maintainer)