io-mapping: Specify mapping size for io_mapping_map_wc()

The ioremap() hidden behind the io_mapping_map_wc() convenience helper
can be used for remapping multiple pages. Extend the helper so that
future callers can use it for larger ranges.

Signed-off-by: Chris Wilson <[email protected]>
Cc: Tvrtko Ursulin <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Yishai Hadas <[email protected]>
Cc: Dan Williams <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: "Peter Zijlstra (Intel)" <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: Luis R. Rodriguez <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Reviewed-by: Luis R. Rodriguez <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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