Thanks for the idea Ivan A. Melnikov.

This is necessary for the 'rootfs' initrd feature to work properly

This package includes some common configuration
we use for BE-T1000 based boards.

cpufreq-simple sets it to ondemand by default, which does
not behave well on some Tavolga kernels.

sm750 is seen as framebuffer-only device, so it's not marked with
master-of-seat tag with current udev (which does this mostly to
dri cards). But without master-of-seat device logind does not
report that the seat "CanGraphical", and thus sddm does not
work for it; there might be other problems, too.

This change adds udev rule that marks sm705's fb device as
master-of-seat.

Tavolga seldom has a serial port connected, so it makes
more sense to write kernel and systemd's messages
to tty1.

We don't know the root UUID at this point; recovery.rc
will deal with it later, but we'd like to have
even the tarball in a somwhat working state.

...with xorg-drv-btsm750 and packaged xorg.conf.