spi: s3c64xx: remove unused S3C64XX_SPI_ST_TRLCNTZ macro

The macro S3C64XX_SPI_ST_TRLCNTZ is not used and hence it is removed.

Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
Acked-by: Jaswinder Singh <jaswinder.singh@linaro.org>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>