Add the required dependencies and config for both hexagonrpcd and
libssc so that sensors start working.
[ci:skip-build]: already built successfully in CI
The device already loads plenty of nonfree-firmware into the
co-processors during the bootloader stages, and also once booted in
Linux won't really be useful without everything.
Additionally I doubt anyone tests that case, so just require nonfree
firmware unconditionally to simplify maintenance.
The qbootctl service tells the bootloader that the current boot has
succeeded, so that the bootloader doesn't switch to the other slot after
~7 tries.
The swclock-offset dependency ensures that the time is set correctly
after a reboot, caused by the read-only RTC on Qualcomm.
[ci:skip-build]: already built successfully in CI
