kernel: Change ASSIGN_ONCE(val, x) to WRITE_ONCE(x, val)

kernel: Change ASSIGN_ONCE(val, x) to WRITE_ONCE(x, val)

[ Upstream commit 43239cbe79fc369f5d2160bd7f69e28b5c50a58c ]

Feedback has shown that WRITE_ONCE(x, val) is easier to use than
ASSIGN_ONCE(val,x).
There are no in-tree users yet, so lets change it for 3.19.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Davidlohr Bueso <dave@stgolabs.net>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>