build: fix stray mod to object rule causing full rebuild everytime
linuxdvb: starting to build up the DVB hardware tree

Still do not have anything working, just trying to get some groundwork done.
prop: Added the concept of a RD-only property

Made use of the rd-only property for display only fields in the DVB
hardware tree.
linuxdvb: split the adapter source into 3 files.
filebundle: correct possible bug with fb_scandir() on some FSs
linuxdvb: starting to add network/mux information
linuxdvb: starting to get config load/save for device tree

I think eventually I will re-work this to one file per entry similar
to the other trees (like network). But this will do for now.