mm/damon: add DAMOS filter type YOUNG

Define yet another DAMOS filter type, YOUNG.  Like anon and memcg, the
type of filter will be applied to each page in the memory region, and see
if the page is accessed since the last check.  Based on the 'matching'
parameter, the page is filtered out or in.

Note that this commit is adding only the type definition.  The
implementation should be made by DAMON operations sets.  A commit for the
implementation on 'paddr' DAMON operations set will follow.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: SeongJae Park <[email protected]>
Tested-by: Honggyu Kim <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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