[IA64] always map VGA framebuffer UC, even if it supports WB

EFI on some machines, e.g., Intel Tiger, reports that the VGA framebuffer
supports WB access.  ioremap() prefers WB when possible, so it can work
when mapping main memory.

But it doesn't make sense to map a framebuffer WB, because the driver
doesn't flush explicitly, so updates won't make it to the device
immediately.

This is due to Zou Nan hai <[email protected]>.

More extensive fix that adds a "size" argument coming soon.

Signed-off-by: Bjorn Helgaas <[email protected]>
Cc: "Antonino A. Daplas" <[email protected]>
Cc: "Luck, Tony" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Tony Luck <[email protected]>

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