SPI is also connected on the board, use that instead of I2C as it's much
faster. Also define platform data now the core driver is in mainline.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
[kgene.kim@samsung.com: fixed build error by inclusion missed header]
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>