fpga manager: xilinx-spi: remove unneeded, mistyped variables

Using variables does not add readability here: parameters passed
to udelay*() are obviously in microseconds and their meaning is clear
from the context.

The type is also wrong, udelay expects an unsigned long.
Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Moritz Fischer <mdf@kernel.org>

drivers/fpga/xilinx-spi.c

@@ -41,8 +41,6 @@ static int xilinx_spi_write_init(struct fpga_manager *mgr,
 				 const char *buf, size_t count)
 {
 	struct xilinx_spi_conf *conf = mgr->priv;
-	const size_t prog_latency_7500us = 7500;
-	const size_t prog_pulse_1us = 1;
 
 	if (info->flags & FPGA_MGR_PARTIAL_RECONFIG) {
 		dev_err(&mgr->dev, "Partial reconfiguration not supported.\n");
@@ -51,7 +49,7 @@ static int xilinx_spi_write_init(struct fpga_manager *mgr,
 
 	gpiod_set_value(conf->prog_b, 1);
 
-	udelay(prog_pulse_1us); /* min is 500 ns */
+	udelay(1); /* min is 500 ns */
 
 	gpiod_set_value(conf->prog_b, 0);
 
@@ -61,7 +59,7 @@ static int xilinx_spi_write_init(struct fpga_manager *mgr,
 	}
 
 	/* program latency */
-	usleep_range(prog_latency_7500us, prog_latency_7500us + 100);
+	usleep_range(7500, 7600);
 	return 0;
 }