CHROMIUM: mm: multigenerational lru: enable by default

Signed-off-by: Sangwhan Moon <sxm@chromium.org>

BUG=b:236705194
TEST=Built

Change-Id: I29b75fceae5615fafa49de5927235564e13c7b29
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/3714579


Tested-by: Yu Zhao <yuzhao@chromium.org>
Commit-Queue: Yu Zhao <yuzhao@chromium.org>
Reviewed-by: Yu Zhao <yuzhao@chromium.org>
Signed-off-by: Richard Fung <richardfung@google.com>