lowmem-controller: Move medium memory action from lowmem to controller

lowmem-controller: Move medium memory action from lowmem to controller

For modulization, medium memory action is moved from lowmem.c(core) to
lowmem-controller.c(controller) and this action will be assigned to
lowmem.c by the initializer of controller.

The dedup_act is moved from lowmem.c to controller since it is an action
of medium memory. But this function is also an action of critical
memory. Thus, a part of critical memory actions was replaced with
lowmem_controller_ops.

Change-Id: I04663b904cfd8c1a18008bc45be74abb2cb6fb47
Signed-off-by: SangYoun Kwak <sy.kwak@samsung.com>