[COMMON] mm: introduce High-order Pages Allocator

[COMMON] mm: introduce High-order Pages Allocator

The high-order pages allocator (aka. HPA) has been introduced to ensure
successful allocation of high-order pages always with given order and size.
The HPA tries to allocate pages from buddy and then if any pages are in use,
tries to reclaim and migrate pages.

Change-Id: I61a7fe76d4a1c6a1058d2fe731bbfef8d3e6959a
Signed-off-by: Jinsung Yang <jsgood.yang@samsung.com>
Signed-off-by: Sunyoung Kang <sy0816.kang@samsung.com>
Signed-off-by: Cho KyongHo <pullip.cho@samsung.com>