lowmemorykiller: Compact memory when killing processes

* Memory compaction is never invoked on Android because we avoid swap
   and don't allocate huge pages. Fix it by invoking compaction from the LMK when
   a process is killed to reduce memory fragmentation.

Change-Id: I2bda790c2093e65fd6f43d52ea5149d6b57cb1e9

Conflicts:

	drivers/staging/android/lowmemorykiller.c
lowmemorykiller: Use asynchronous compaction

Change-Id: I6a65d06fc30b88fcedaaf1abf1855fdd19e3c912
drivers: staging: android: lmk compile fixup

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>
android: lowmemkiller: backported from android-3.4
cpuquiet: some changes from laufersteppenwolf

Change-Id: Ie40303b32ab9b40d323ea2463f6cf2f744058c50
Merge changes Ie40303b3,I518daeb0,Ie3f9f6af,I6a65d06f,Ie52d642a into jb-mr1_mkt

* changes:
  cpuquiet: some changes from laufersteppenwolf
  android: lowmemkiller: backported from android-3.4
  drivers: staging: android: lmk compile fixup
  lowmemorykiller: Use asynchronous compaction
  lowmemorykiller: Compact memory when killing processes