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>

arch/x86/kernel/probe_roms.c

@@ -150,7 +150,7 @@ static struct resource *find_oprom(struct pci_dev *pdev)
 	return oprom;
 }
 
-void *pci_map_biosrom(struct pci_dev *pdev)
+void __iomem *pci_map_biosrom(struct pci_dev *pdev)
 {
 	struct resource *oprom = find_oprom(pdev);