main/linux-postmarketos-allwinner: enable iwd opts

Enable options required to run iwd instead of wpa_supplicant for the aarch64 kernel config. Make it easier to test this, before we consider switching to iwd as default (and enforcing kernel options in all devices in main and community).

/usr/libexec/iwd complains if options are missing, so I simply ran that to figure out what needs to be enabled.

Related: postmarketos#45 (closed)