CHROMIUM: ARCVM: config: Enable lazy RCU

This enables lazy RCU config for power savings.

BUG=b:222463781
TEST=ARCVM Idle power lab tests.

Signed-off-by: Joel Fernandes <joelaf@google.com>
Signed-off-by: Parshuram Sangle <parshuram.sangle@intel.corp-partner.google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/3965650


Reviewed-by: Ross Zwisler <zwisler@google.com>
Change-Id: I5569d218d9caecf91686e0f4308c2fa2a721909a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/4069549