commit 891271c2 "ASoC: Convert wm8804 to direct regmap API usage"
only converts wm8804_spi_probe to use regmap_init_spi.

This patch adds missing regmap_init_i2c in wm8804_i2c_probe.
Signed-off-by: NAxel Lin <axel.lin@gmail.com>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>