YOCTO: arm_versatile_926ejs: kick off PrimeCell RTC PL031

For RTC PL031, need to explicitly set bit "RTC start" of Control
register(RTCCR) to enable it's counting.

Signed-off-by: Tony Liu <Bo.Liu@windriver.com>
Signed-off-by: Amit Kucheria <amit.kucheria.ext@huawei.com>

drivers/rtc/rtc-pl031.c

@@ -379,8 +379,12 @@ static int pl031_probe(struct amba_device *adev, const struct amba_id *id)
 				  vendor->irqflags, "rtc-pl031", ldata);
 		if (ret)
 			goto out;
+		/*Set bit "RTC start" in register RTCCR to enable RTC */
+		writel(0x1, ldata->base + RTC_CR);
+
 		dev_pm_set_wake_irq(&adev->dev, adev->irq[0]);
 	}
+
 	return 0;
 
 out: