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H A Dio.h30928c1151225f4f318521bb3e04fa8431f7a938 Sat Mar 12 05:07:06 UTC 2016 Simon Glass <sjg@chromium.org> x86: Add macros to clear and set I/O bits

The clrsetbits_...() macros are useful for working with memory mapped I/O.
But they do not work with I/O space, as used on x86 machines.

Add some macros to provide similar features for I/O.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>