x86/io: Define IO accessors by preprocessor

As a preparatory to use generic IO accessor helpers we need to define
architecture dependent functions via preprocessor to let world know we
have them.

Signed-off-by: Andy Shevchenko <[email protected]>
Acked-by: Wolfram Sang <[email protected]>
Cc: Baolin Wang <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Mika Westerberg <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[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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