The legacy S3C64xx DMA driver has been removed, DMA support on
S3C64xx is provided only by the generic PL08x driver.

This patch modifies the Kconfig entry of spi-s3c64xx driver, which
relies on availability of DMA, to always select the S3C64XX_PL080
symbol.
Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>