camellia-aarch64: do not export look-up table globally

* cipher/camellia-aarch64.S (_gcry_camellia_arm_tables): Remove
'.globl' export.

• Reported-by: Martin Husemann <martin@NetBSD.org>
• GnuPG-bug-id: T4317
• Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>