mox: enable SafeXcel Crypto Engine module
This enabled SafeXcel cryptographic engine driver [1], which is packaged in OpenWrt [2].
[1] https://cateee.net/lkddb/web-lkddb/CRYPTO_DEV_SAFEXCEL.html [2] https://github.com/openwrt/openwrt/blob/23c77384f3d191a825fff5e58807ab6d539d5e0e/package/kernel/linux/modules/crypto.mk#L406
This is enabled based on https://espressobin.net/forums/topic/mainline-kernel-5-15-on-espressobin/#post-50261
cc: @prohar