ASoC: wm8962: Unconditionally wait for the FLL to lock

If the FLL is being shut down we will exit early so there is no need to
check here and in fact we're checking the wrong thing anyway.

Reported-by: Graeme Gregory <gg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>