Revert "si4708: minor simplification"

This reverts commit 28fa7dfa2974d9422ce69a625398cc58b276dc09.
Revert "si4708: cleanup"

This reverts commit 3a890c923ba574eddb947c7c3b0a491b284d15bf.
Revert "si4708: enable fullscan"

This reverts commit f9ce7fce9bb5dadf3c408cd2475152a1e2f280fa.
Revert "libaudio: fix FM stream refcount"

This reverts commit 4503806b91ab1a05d4b954d4bd56fd9751578450.
Revert "Replace FmRadioReceiver by Effem"

This reverts commit 6f15a3554c569b83c49c85a438d154e1a4205da8.
Revert "Automatically switch FM audio according to virtual device"

This reverts commit 90f5447c66b319eca739e9451fe87b321785939f.
Revert "si4708: use mute IOCTL"

This reverts commit eb587e73695956038963d88b399342c9d9f72846.
Revert "si4708: add RDS support"

This reverts commit 78f7bc97cb686af9ea0a89b1f47f95918a8c8f0d.
Revert "Build libfmradio by default"

This reverts commit 2edc4d6085fd67993a3837197ebe966f4550d967.
Revert "Fix FM audio routing"

This reverts commit a2cb3155e2582a1178c4eda11d5ec33160a982de.
Revert "FM radio support (part 2)"

This reverts commit aae45320a35ccb1aee0bec4f14374692569b912e.
Revert "si4708: configure de-emphasis according to selected band"

This reverts commit c16adfdffff1afc44e3bdb60a72e5e1e2792f83f.
Revert "FM Radio support (part 1)"

This reverts commit f1d94f78cd9e7fec297fd975be14b4933fcaf596.