timekeeping: Add percpu counter for tracking floor swap events

The mgtime_floor value is a global variable for tracking the latest
fine-grained timestamp handed out. Because it's a global, track the
number of times that a new floor value is assigned.

Add a new percpu counter to the timekeeping code to track the number of
floor swap events that have occurred. A later patch will add a debugfs
file to display this counter alongside other stats involving multigrain
timestamps.

Signed-off-by: Jeff Layton <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Tested-by: Randy Dunlap <[email protected]> # documentation bits
Link: https://lore.kernel.org/all/[email protected]
Signed-off-by: Christian Brauner <[email protected]>

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