ARCVM: config: enable multigenerational lru

Enable MGLRU in the ARCVM kernel

BUG=b:213475212
TEST=Confirm that the kernel can be successfully built

Change-Id: I09456fffed6df5f3705515eb9453a12de2836187
Signed-off-by: Koki Ryu <kokiryu@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/4199783


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