x86/pci/probe_roms: Add missing __iomem annotation to pci_map_biosrom()

Stay in sync with the declaration and fix the corresponding
sparse warnings.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Link: http://lkml.kernel.org/r/1346621506-30857-5-git-send-email-minipli@googlemail.com


Signed-off-by: Ingo Molnar <mingo@kernel.org>