pci: frv architecture needs generic setup-bus infrastructure

Otherwise we get this link failure for frv's defconfig:

   LD      .tmp_vmlinux1
 drivers/built-in.o: In function `pci_assign_resource':
 (.text+0xbf0c): undefined reference to `pci_cardbus_resource_alignment'
 drivers/built-in.o: In function `pci_setup':
 pci.c:(.init.text+0x174): undefined reference to `pci_realloc_get_opt'
 pci.c:(.init.text+0x1a0): undefined reference to `pci_realloc_get_opt'
 make[1]: *** [.tmp_vmlinux1] Error 1

Cc: David Howells <dhowells@redhat.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>