regulator: wm8994: Use main I2C device as struct device

This makes logging a bit clearer as it gives the actual bus location and
makes things like board hookup a bit smoother.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2012-05-08 17:45:31 +01:00
commit 5d0526eade