To prepare for abstracting adding SPI support, the I2C pieces needs to
be in its own moudle.  This patch moves common probe code into aic32x4_probe
and common removal code into aic32x4_remove.  It also creates a static
regmap config structure to be copied in the I2C specific driver.
Signed-off-by: NJeremy McDermond <nh6z@nh6z.net>
Signed-off-by: NMark Brown <broonie@kernel.org>