Revert "ion: convert system heap to alloc_page()"

This reverts commit 3fb79c829d32b68b9dccb4a8610a0e16780db1a3.
relaxed overtweaked sio
ARM: 7632/1: spinlock: avoid exclusive accesses on unlock() path

When unlocking a spinlock, all we need to do is increment the owner
field of the lock. Since only one CPU can be performing an unlock()
operation for a given lock, this doesn't need to be exclusive.

This patch simplifies arch_spin_unlock to use non-exclusive accesses
when updating the owner field of the lock.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Revert "OMAP4: PM: IVA AUTO RET relaxed workaround in idle path"

This reverts commit 885508a49ba9f5c1fc33b1f3aa0f58cfe4ba5491.
Kernel Version: AK.237.SKL