spi: bfin_spi: Use DIV_ROUND_UP instead of open-coded

Use DIV_ROUND_UP to simplify the code.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Scott Jiang <scott.jiang.linux@gmail.com>
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>

drivers/spi/bfin_spi.c

@@ -144,10 +144,8 @@ void spi_set_speed(struct spi_slave *slave, uint hz)
 	u32 baud;
 
 	sclk = get_sclk();
-	baud = sclk / (2 * hz);
 	/* baud should be rounded up */
-	if (sclk % (2 * hz))
-		baud += 1;
+	baud = DIV_ROUND_UP(sclk, 2 * hz);
 	if (baud < 2)
 		baud = 2;
 	else if (baud > (u16)-1)