When building the mediatek/mt7629 target in OpenWrt 22.03 the kernel
does not have a configuration option for CONFIG_CRYPTO_DEV_MEDIATEK. Add
this option to the generic kernel configuration and also add two other
configuration options which are removed when we refresh the mt7629
kernel configuration.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>