On cold boot, msm-modem-uim-selection's default 4-second SIM
detection timeout expires before the modem's UIM service is ready,
leaving ModemManager stuck in a "sim-missing" failed state and
requiring the user to manually run `systemctl restart ModemManager`.
Install a systemd drop-in override that increases SIM_WAIT_TIME from
the default 4 seconds to 30 seconds, giving the modem enough time to
finish initializing on this device.
Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/8428>
