usb: renesas_usbhs: replace udelay() with usleep_range()

According to Documentation/timers/timers-howto.txt, a driver should
use usleep_range() instead of udelay() on NON-ATOMIC CONTEXT if
"SLEEPING FOR ~USECS OR SMALL MSECS ( 10us - 20ms)".

Since the .hardware_init() and .power_ctrl() will run on NON-ATOMIC
CONTEXT, this patch replaces udelay() with usleep_range().
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/renesas_usbhs/rcar3.c

@@ -59,7 +59,7 @@ static int usbhs_rcar3_power_ctrl(struct platform_device *pdev,
 	if (enable) {
 		usbhs_bset(priv, LPSTS, LPSTS_SUSPM, LPSTS_SUSPM);
 		/* The controller on R-Car Gen3 needs to wait up to 45 usec */
-		udelay(45);
+		usleep_range(45, 90);
 	} else {
 		usbhs_bset(priv, LPSTS, LPSTS_SUSPM, 0);
 	}

drivers/usb/renesas_usbhs/rza.c

@@ -35,7 +35,7 @@ static int usbhs_rza1_hardware_init(struct platform_device *pdev)
 
 	/* Enable USB PLL (NOTE: ch0 controls both ch0 and ch1) */
 	usbhs_bset(priv, SYSCFG, UPLLE, UPLLE);
-	udelay(1000);
+	usleep_range(1000, 2000);
 	usbhs_bset(priv, SUSPMODE, SUSPM, SUSPM);
 
 	return 0;