spi: fsl-lpspi: remove unneeded array

[ Upstream commit 2fa98705a9289c758b6154a22174aa8d4041a285 ]

- replace the array with the shift operation
- remove the extra comparing operation.

Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
Link: https://lore.kernel.org/r/20200220141143.3902922-2-oleksandr.suvorov@toradex.com


Signed-off-by: Mark Brown <broonie@kernel.org>
Stable-dep-of: 730bbfaf7d48 ("spi: spi-fsl-lpspi: Fix scldiv calculation")
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit da6cc32c245500f417e4b96d67722b8a0a07fd94)
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>