ksm: Provide support to use deferred timers for scanner thread

KSM thread to scan pages is getting schedule on definite timeout.
That wakes up CPU from idle state and hence may affect the power
consumption. Provide an optional support to use deferred timer
which suites low-power use-cases.

To enable deferred timers,
$ echo 1 > /sys/kernel/mm/ksm/deferred_timer

Signed-off-by: Chintan Pandya <cpandya@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>