mcslock: use wait until scheme for unlock
mcslock: use wait until scheme for unlock

Instead of polling for mcslock to be updated, use wait until scheme
for this case.

Signed-off-by: Feifei Wang <2493857810266eaae720c9869c8b9d6ce45d3739@arm.com>
Reviewed-by: Ruifeng Wang <a548d51fbc42485a8ba807711a537e88c2b59dd2@arm.com>
Acked-by: Jerin Jacob <352c4d4f9291b869992ddb67daa45ddc149fed30@marvell.com>

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