image-rpi64: Install missing connman overlay for autoconfig

Task https://phabricator.apertis.org/T8966

Commit 717dda2c ("image-rpi64: Install rpi64-autoconfig-connman package") installed the rpi64-autoconfig-connman package on rpi64 recipes. However, it missed the required overlay so connman enables wifi by default.

Note that original purpose of this feature is to allow users to configure the system wifi on a headless system without even a shell.

Signed-off-by: Ariel D'Alessandro ariel.dalessandro@collabora.com