Reduce rootfs size a bit by installing the separated firmware packages
instead of the large linux-firmware-qcom package. Also, install the
modem firmware by default to prepare for enabling GPS.
[ci:ignore-count]
[ci:skip-vercheck] needed for the postmarketos-ui-* packages in this
series
[ci:skip-build] already built ui-* packages in CI, and device pacakges
are just trivial deviceinfo change (manually built some just to verify)
I sometimes test DB410c via mainline U-Boot, which wants to have the
DTB in the "second" part of the Android boot image. Otherwise it works
fine. Include it there additionally to simplify this.
[ci:skip-build] already built successfully in CI
