mm/damon/core: implement DAMON context commit function

Implement functions for supporting online DAMON context level parameters
update.  The function receives two DAMON context structs.  One is the
struct that currently being used by a kdamond and therefore to be updated.
The other one contains the parameters to be applied to the first one. 
The function applies the new parameters to the destination struct while
keeping/updating the internal status and operation results.  The function
should be called from DAMON context-update-safe place, like DAMON
callbacks.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: SeongJae Park <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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