move bus (PCI, PCMCIA, EISA, rapdio) config to drivers/ v4

[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/.

Changes since v3:
 - drop the patches already merged
 - fix a typo in the PCI help text
 - split the always enable PCI on alpha change into a separate patch
 - remove the mips HT_PCI symbol
 - add a new FORCE_PCI symbol to easily allow selecting PCI support
 - new patch to consolidate PCI_DOMAINS
 - new patch to consolidate PCI_SYSCALL

Changes since v2:
 - depend on HAVE_PCI for PCIe endpoint code
 - fix some commit message typos
 - remove CONFIG_PCI from xtensa iss defconfig
 - drop EISA support from arm
 - clean up EISA selection for alpha

Changes since v1:
 - rename all HAS_* Kconfig symbols to HAVE_*
 - drop the CONFIG_PCI_QSPAN option entirely
 - drop duplicate select from powerpc
 - restore missing selection of PCI_MSI for riscv
 - update x86 and riscv defconfigs to include PCI
 - actually inclue drivers/eisa/Kconfig
 - adjust some captilizations