systemd: No longer provide firmwares to the kernel. //!\ This currently breaks every port of AsteroidOS /!\ /!\

systemd: Hardcode the udevd's firmware search path with a patch since the meta-smartphone's bbappend is not effective anymore since systemd switched its build system to Meson. Yeah right, you can call this a hack but I couldn't find a better way to set the macro defined by Meson to an array of strings...

systemd: Disable power key handling which would shut down the watch when pressed. MCE is there for that.

Make sure user services are only run as ceres. Since openssh uses pam login, ssh root@watchIp would open a new systemd user session and start asteroid-launcher or other services as root

systemd: gives right to /dev/mm_interlock and /dev/mm_v3d to the video group to allow to run asteroid-launcher as ceres on tetra

This reverts commit 04acc8b6.