ASoC: adau7118: Mark the ADAU7118 reset register as volatile

Without this the previously written value was written to this reg,
which caused the different configuration registers to be reset.

Signed-off-by: Chris Garren <cdgarren@indesign-llc.com>
Link: https://lore.kernel.org/r/1588599820-57994-1-git-send-email-cdgarren@indesign-llc.com


Signed-off-by: Mark Brown <broonie@kernel.org>