spi: s3c64xx: fix checkpatch error and warnings

Fix the following checkpatch error and warnings:

  ERROR: "(foo*)" should be "(foo *)"
  WARNING: line over 80 characters
  WARNING: quoted string split across lines

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Mark Brown <broonie@linaro.org>