lowmem-controller: Split up lowmem-controller feature from lowmem module
The lowmem-controller.c was created by extracting the killing-process
feature from lowmem.c.
* Newly created: lowmem-controller.c, lowmem-controller.h
* "lowmem_controller_kill_candidates" function of
lowmem-controller.c kills procs/apps from candidates list provided
by the core(lowmem.c).
* Symbols used only in lowmem-controller.c were moved from lowmem.c
to lowmem-controller.c.
* Symbols used both lowmem.c and lowmem-controller.c were moved from
lowmem.c to lowmem.h.
Change-Id: I8bd0f65acc9df771385c1839096f1283424ce2a5
Signed-off-by: SangYoun Kwak <sy.kwak@samsung.com>