spi: Use dev_get_drvdata at appropriate places

Use dev_get_drvdata() instead of platform_get_drvdata(to_platform_device(dev)).

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

diff --cc drivers/spi/spi-bcm63xx.c
Simple merge

diff --cc drivers/spi/spi-coldfire-qspi.c
Simple merge

diff --cc drivers/spi/spi-s3c24xx.c
Simple merge

diff --cc drivers/spi/spi-sirf.c
Simple merge