s390/io: Add pci_iomap_wc() and pci_iomap_wc_range()

The following commit:

  1b3d4200c1e0 ("PCI: Add pci_iomap_wc() variants")

Introduced pci_iomap_wc() variants but broke the s390 build,
because s390 requires its own implementation of pcio_iomap*()
calls.

The reason for that is that:

  "BAR spaces are not disjunctive on s390 so we need the bar
   parameter of pci_iomap to find the corresponding device
   and create the mapping cookie"

so it has its own lookup/lock solution and it does not include
asm-generic/pci_iomap.h.

Since it currenty maps ioremap_wc() to ioremap_nocache() and
that's the architecture default we can easily just map the wc
calls to the default calls as well.

Reported-by: kbuild test robot <[email protected]>
Signed-off-by: Luis R. Rodriguez <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Fengguang Wu <[email protected]>
Cc: Frank Blaschka <[email protected]>
Cc: Guenter Roeck <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Jean-Christophe Plagniol-Villard <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Martin Schwidefsky <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Thierry Reding <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Tomi Valkeinen <[email protected]>
Cc: Toshi Kani <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

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