spi: spi-s3c64xx.c Remove unused argument.

The pointer to the driver data is never used to get the slave
control data. We can delete the unused argument from the function.

Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
spi: spi-omap2-mcspi.c: Add dts for slave device configuration.

TI omap2 mcspi allows the slave devices to configure the behavior of
the SPI master. This patch adds device tree support to the existing
options.

Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>