spi: spi-s3c64xx: Fix indentation in the register offset definitions

Change indentation so register address offset and register bit definitions
are aligned to same column.
Signed-off-by: NSylwester Nawrocki <s.nawrocki@samsung.com>
Reviewed-by: NAndi Shyti <andi@etezian.org>
Reviewed-by: NKrzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: NMark Brown <broonie@kernel.org>