Remove all firmware-support dependencies from the firmware package and
add them to -downstream-firmware and -mainline-firmware packages which
have an install_if on the downstream or mainline kernel subpackage.
[ci:skip-build]: already built successfully in CI
The modem boots up properly without causing any problems, so let's
install the firmware and support packages by default.
Also install adsp-audio now by default to boot up the adsp for audio and
other services provided by the processor.
[ci:skip-build]: already built successfully in CI
