m68k: coldfire: select PCI_IOMAP for PCI

After I dropped CONFIG_GENERIC_IOMAP, some PCI drivers started failing
to link when CONFIG_MMU is disabled:

ERROR: modpost: "pci_iounmap" [drivers/video/fbdev/i740fb.ko] undefined!
ERROR: modpost: "pci_iounmap" [drivers/video/fbdev/vt8623fb.ko] undefined!
ERROR: modpost: "pci_iomap_wc" [drivers/video/fbdev/vt8623fb.ko] undefined!
ERROR: modpost: "pci_iomap" [drivers/video/fbdev/vt8623fb.ko] undefined!
ERROR: modpost: "pci_iounmap" [drivers/video/fbdev/s3fb.ko] undefined!
...

It turns out that there were two mistakes in my patch: on !MMU I forgot
to enable CONFIG_GENERIC_PCI_IOMAP, and for Coldfire with MMU enabled,
teh GENERIC_IOMAP was left in place but incorrectly configured.

Fixes: 9d48cc07d0d7 ("m68k/nommu: stop using GENERIC_IOMAP")
Reported-by: Greg Ungerer <[e-mail]>
Acked-by: Greg Ungerer <[e-mail]>
Signed-off-by: Arnd Bergmann <[e-mail]>

arch/m68k/Kconfig

···
 	select DMA_DIRECT_REMAP if M68K_NONCOHERENT_DMA && !COLDFIRE
 	select GENERIC_ATOMIC64
 	select GENERIC_CPU_DEVICES
-	select GENERIC_IOMAP if HAS_IOPORT && MMU
+	select GENERIC_IOMAP if HAS_IOPORT && MMU && !COLDFIRE
 	select GENERIC_IRQ_SHOW
 	select GENERIC_LIB_ASHLDI3
 	select GENERIC_LIB_ASHRDI3
 	select GENERIC_LIB_LSHRDI3
 	select GENERIC_LIB_MULDI3
+	select GENERIC_PCI_IOMAP if PCI
 	select HAS_IOPORT if PCI || ISA || ATARI_ROM_ISA
 	select HAVE_ARCH_LIBGCC_H
 	select HAVE_ARCH_SECCOMP