spi: Rename spi-cs-setup-ns property to spi-cs-setup-delay-ns

As mentioned in the corresponding DT binding commit, the naming scheme
for delay properties includes "delay" in the name, so let's keep that
consistent.

Fixes: 33a2fde5 ("spi: Introduce spi-cs-setup-ns property")
Signed-off-by: Hector Martin <marcan@marcan.st>
Link: https://lore.kernel.org/r/20230104093631.15611-3-marcan@marcan.stSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi.c

@@ -2310,7 +2310,7 @@ static int of_spi_parse_dt(struct spi_controller *ctlr, struct spi_device *spi,
 	if (!of_property_read_u32(nc, "spi-max-frequency", &value))
 		spi->max_speed_hz = value;
 
-	if (!of_property_read_u16(nc, "spi-cs-setup-ns", &cs_setup)) {
+	if (!of_property_read_u16(nc, "spi-cs-setup-delay-ns", &cs_setup)) {
 		spi->cs_setup.value = cs_setup;
 		spi->cs_setup.unit = SPI_DELAY_UNIT_NSECS;
 	}