kernel: add support for authenc(hmac(md5),*) on safexcel

kernel: add support for authenc(hmac(md5),*) on safexcel

This patch adds support for the following AEAD ciphersuites:
- authenc(hmac(md5),cbc(aes))
- authenc(hmac(md5),cbc(des)))
- authenc(hmac(md5),cbc(des3_ede))
- authenc(hmac(md5),rfc3686(ctr(aes)))

These algorithms are used mainly for backward compatibility with some
older equipment. This is enhanced version of the patch found in the
mtk-openwrt-feeds repo.

All cipher suites were tested using test vectors on the MediaTek MT7981,
MT7986, and MT7988.

Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl>
Link: https://github.com/openwrt/openwrt/pull/22410
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>