ASoC: Remove unneeded use of address-of operator

There is no need to use '&' in this case.  Either way, if a is an array
of some type, then a == &a == &a[0].

Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>