move bus (PCI, PCMCIA, EISA, rapdio) config to drivers/

[Christoph Hellwig]

Hi all,

currently every architecture that wants to provide on of the common
periphal busses needs to add some boilerplate code and include the
right Kconfig files.   This series instead just selects the presence
(when needed) and then handles everything in the bus-specific
Kconfig file under drivers/.