ARM: pxa: pxa27x.c: add dummy SA1100 rtc clock

Using pxa27x you could now build both RTC_DRV_PXA and RTC_DRV_SA1100.
Make sure you don't use both together: link /dev/rtc0 or /dev/rtc1
to /dev/rtc according to your requirement.
Signed-off-by: NAndrea Adami <andrea.adami@gmail.com>
Acked-by: NRobert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: NHaojian Zhuang <haojian.zhuang@gmail.com>

arch/arm/mach-pxa/pxa27x.c

@@ -230,6 +230,7 @@ static struct clk_lookup pxa27x_clkregs[] = {
 	INIT_CLKREG(&clk_pxa27x_memc, NULL, "MEMCLK"),
 	INIT_CLKREG(&clk_pxa27x_mem, "pxa2xx-pcmcia", NULL),
 	INIT_CLKREG(&clk_dummy, "pxa-gpio", NULL),
+	INIT_CLKREG(&clk_dummy, "sa1100-rtc", NULL),
 };
 
 #ifdef CONFIG_PM