s5j/spi: clean spi driver code
s5j/spi: clean spi driver code

Removed unsed pieces of code, added functions descriptions.
Hardcoding replaced with macro definitions.

Change-Id: I85baf30af0c3d87df8340664bcefdf7d21e99d54
Signed-off-by: Ivan <1d9e920f53f2b50855e44b4038bceca9a1f13f2b@samsung.com>

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