ASoC: soc-cache: Remove unnecessary debugging info

No need to print the register-value pair again, as we've already hooked
snd_soc_write() for that matter.

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>