spi: add locomo SPI driver

LoCoMo chip has a built-in simple SPI controller. On Sharp SL-5500 PDDAs
it is connected to external MMC slot.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
collie: add mmc_spi platform data

Collie has MMC card slot connected through LoCoMo SPI controller. Add
necessary board info to use the MMC card slot.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>