staging: lowmemorykiller: Add memory hotplug to LMK

Signed-off-by: Andrei F <luxneb@gmail.com>

Conflicts:
	drivers/staging/android/lowmemorykiller.c
config dump #! for tonight
mm: Do not stall in synchronous compaction for THP allocations
lib/vsprintf: replace link to Draft by final RFC number
ARM: 7755/1: handle user space mapped pages in flush_kernel_dcache_page
ARM: 7772/1: fix missing flush_kernel_dcache_page() for noMMU
AIO: don't plug the I/O queue in do_io_submit()
config dump #2
Revert "ARM: 7772/1: fix missing flush_kernel_dcache_page() for noMMU"

This reverts commit 0f63ef2ddd285103efa160cea35299e6afa873fe.
Revert "ARM: 7755/1: handle user space mapped pages in flush_kernel_dcache_page"

This reverts commit 75307468ba2d51cccc15cc38982965dc3ac3675d.