Fix SPI NO Slave Select macro definition, when all the SPI CS bits
are high which means no slave is selected.

Fixes: 21b511dd ("spi: spi-cadence: Fix SPI CS gets toggling sporadically")
Signed-off-by: NSai Krishna Potthuri <lakshmi.sai.krishna.potthuri@xilinx.com>
Signed-off-by: NAmit Kumar Mahapatra <amit.kumar-mahapatra@xilinx.com>
Link: https://lore.kernel.org/r/20220713164529.28444-1-amit.kumar-mahapatra@xilinx.comSigned-off-by: NMark Brown <broonie@kernel.org>