ARM: 5787/1: U300 COH 901 331 fixes

This will fix some small issues with the COH 901 331 RTC driver:
- Interrupt is disabled after alarm so that we don't fire
  multiple interrupts.
- We return 0 from the coh901331_alarm_irq_enable() ridding
  a compile warning.
- We alter the name in the U300 device registry to match that
  of the driver so they sucessfully resolve.

Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-u300/core.c

@@ -408,7 +408,7 @@ static struct platform_device keypad_device = {
 };
 
 static struct platform_device rtc_device = {
-	.name = "rtc0",
+	.name = "rtc-coh901331",
 	.id = -1,
 	.num_resources = ARRAY_SIZE(rtc_resources),
 	.resource = rtc_resources,