According to MACHINEOVERRIDES, alix and apu2 are subclass machines of
sysmocom-bsc (abstract superclass). However, only alix requires
sysmocom-bsc.conf. Make both alix and apu2 requires sysmocom-bsc.conf,
and move alix specific stuff to sysmocom-alix.conf.
In the process, linux-firmware-rtl-nic is removed from RDEPENDS for
apu2, since it doesn't use RTL nic but e100e/igb ones.
As a result of these movements, osmo-bsc.conf is actually empty, but
it's left there for future additions which have to affect both machines:
ie. adding stuff which is expected for "bsc" role on machines containing
no BTS.
Pau Espin
Harald Welte
Holger Hans Peter Freyther