arm64: defconfig: Enable CRYPTO_DEV_FSL_CAAM

Both the i.MX8MQ and i.MX8M Mini support the CAAM driver, but it
is currently not enabled by default.

This patch enables this as a module.

Signed-off-by: Adam Ford <aford173@gmail.com>
Reviewed-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>