timekeeping: Prints the amounts of time spent during suspend

In addition to keeping a histogram of suspend times, also
print out the time spent in suspend to dmesg.

This helps to keep track of suspend time while debugging using
kernel logs.

Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Richard Cochran <[email protected]>
Cc: Prarit Bhargava <[email protected]>
Signed-off-by: Ruchi Kandoi <[email protected]>
[jstultz: Tweaked commit message]
Signed-off-by: John Stultz <[email protected]>

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