ehci-atmel: fix compiler warning

Commit 7a101e946cba55e32d3d1265e30456c810046da3 introduced following warning:
---8<---
ehci-atmel.c: In function 'ehci_hcd_init':
ehci-atmel.c:49:2: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
ehci-atmel.c: In function 'ehci_hcd_stop':
ehci-atmel.c:79:2: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
--->8---

This patch fixes it.

Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
cc: Bo Shen <voice.shen@atmel.com>
cc: Marek Vasut <marex@denx.de>

drivers/usb/host/ehci-atmel.c

@@ -46,7 +46,7 @@ int ehci_hcd_init(void)
 	start_time = get_timer(0);
 	/* Enable UTMI PLL */
 	writel(AT91_PMC_UPLLEN | AT91_PMC_BIASEN, &pmc->uckr);
-	while (readl(&pmc->sr) & AT91_PMC_LOCKU != AT91_PMC_LOCKU) {
+	while ((readl(&pmc->sr) & AT91_PMC_LOCKU) != AT91_PMC_LOCKU) {
 		WATCHDOG_RESET();
 		tmp_time = get_timer(0);
 		if ((tmp_time - start_time) > EN_UPLL_TIMEOUT) {
@@ -76,7 +76,7 @@ int ehci_hcd_stop(void)
 	start_time = get_timer(0);
 	/* Disable UTMI PLL */
 	writel(readl(&pmc->uckr) & ~AT91_PMC_UPLLEN, &pmc->uckr);
-	while (readl(&pmc->sr) & AT91_PMC_LOCKU == AT91_PMC_LOCKU) {
+	while ((readl(&pmc->sr) & AT91_PMC_LOCKU) == AT91_PMC_LOCKU) {
 		WATCHDOG_RESET();
 		tmp_time = get_timer(0);
 		if ((tmp_time - start_time) > EN_UPLL_TIMEOUT) {