ASoC: Support !CONFIG_REGMAP builds

Since we changed regmap to be selected and register per bus rather than
via the core only we can't rely on it being enabled by the ASoC core.
Support compiling it out.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Reported-by: Axel Lin <axel.lin@gmail.com>
1 file changed