CHROMIUM: Implementation of MGLRU in sysfs

This is a reland of CL:3965160 after the backport of the latest MGLRU.
Tested on x86_64 device.

This cherry-pick also contains the changes in  CL:3995292 and CL:4004384.

BUG=b:265245396
TEST=Manual testing on DUT

Signed-off-by: Koki Ryu <kokiryu@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/4199784


Tested-by: Koki Ryu <kokiryu@chromium.org>
Reviewed-by: Suleiman Souhlal <suleiman@chromium.org>
Change-Id: I285fee75c265130530367f245bf647b4b97f50f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/4252301


Commit-Queue: Koki Ryu <kokiryu@chromium.org>
Signed-off-by: Richard Fung <richardfung@google.com>