rtc: sa1100: declare irq in resource

Avoid to hard coded irq in rtc-sa1100 driver since we could share
it among arch-sa1100/arch-pxa/arch-mmp.

We still keep hard coded register address since the requirement is
enabling both rtc-sa1100 and rtc-pxa driver. The register addresses
are conflict since they're only two wrappers on the same rtc device.

Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 3a125b8..59efc63 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -773,8 +773,8 @@
 	  will be called rtc-ep93xx.
 
 config RTC_DRV_SA1100
-	tristate "SA11x0/PXA2xx"
-	depends on ARCH_SA1100 || ARCH_PXA
+	tristate "SA11x0/PXA2xx/PXA910"
+	depends on ARCH_SA1100 || ARCH_PXA || ARCH_MMP
 	help
 	  If you say Y here you will get access to the real time clock
 	  built into your SA11x0 or PXA2xx CPU.