spi: spi-axi-spi-engine: remove usage of delay_usecs

The 'delay_usecs' field was handled for backwards compatibility in case
there were some users that still configured SPI delay transfers with
this field.

They should all be removed by now.
Signed-off-by: Alexandru Ardelean <aardelean@deviqon.com>
Link: https://lore.kernel.org/r/20210308145502.1075689-2-aardelean@deviqon.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-axi-spi-engine.c

@@ -170,14 +170,10 @@ static void spi_engine_gen_sleep(struct spi_engine_program *p, bool dry,
 	unsigned int t;
 	int delay;
 
-	if (xfer->delay_usecs) {
-		delay = xfer->delay_usecs;
-	} else {
 	delay = spi_delay_to_ns(&xfer->delay, xfer);
 	if (delay < 0)
 		return;
 	delay /= 1000;
-	}
 
 	if (delay == 0)
 		return;