Documentation/ABI: Document umwait control sysfs interfaces

Since two new sysfs interface files are created for umwait control, add
an ABI document entry for the files:

   /sys/devices/system/cpu/umwait_control/enable_c02
   /sys/devices/system/cpu/umwait_control/max_time

[ tglx: Made the write value instructions readable ]

Signed-off-by: Fenghua Yu <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Ashok Raj <[email protected]>
Cc: "Borislav Petkov" <[email protected]>
Cc: "H Peter Anvin" <[email protected]>
Cc: "Andy Lutomirski" <[email protected]>
Cc: "Peter Zijlstra" <[email protected]>
Cc: "Tony Luck" <[email protected]>
Cc: "Ravi V Shankar" <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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