x86, reboot: Only use CF9_COND automatically, not CF9

Only CF9_COND is appropriate for inclusion in the default chain, not
CF9; the latter will poke that register unconditionally, whereas
CF9_COND will at least look for PCI configuration method #1 or #2
first (a weak check, but better than nothing.)

CF9 should be used for explicit system configuration (command line or
DMI) only.

Cc: Aubrey Li <[email protected]>
Cc: Matthew Garrett <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: H. Peter Anvin <[email protected]>

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