[ARM] 4935/1: AT91CAP9: enable RTC-on-RTT in defconfig.

Update the help text for RTC_DRV_AT91SAM9 to mention that the
option apply to AT91CAP9 processors too, and enable it in the
defconfig.

Signed-off-by: Stelian Pop <stelian@popies.net>
Signed-off-by: Andrew Victor <linux@maxim.org.za>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 6cc2c03..7fb4c48 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -484,12 +484,13 @@
 	  this is powered by the backup power supply.
 
 config RTC_DRV_AT91SAM9
-	tristate "AT91SAM9x"
+	tristate "AT91SAM9x/AT91CAP9"
 	depends on ARCH_AT91 && !(ARCH_AT91RM9200 || ARCH_AT91X40)
 	help
-	  RTC driver for the Atmel AT91SAM9x internal RTT (Real Time Timer).
-	  These timers are powered by the backup power supply (such as a
-	  small coin cell battery), but do not need to be used as RTCs.
+	  RTC driver for the Atmel AT91SAM9x and AT91CAP9 internal RTT
+	  (Real Time Timer). These timers are powered by the backup power
+	  supply (such as a small coin cell battery), but do not need to
+	  be used as RTCs.
 
 	  (On AT91SAM9rl chips you probably want to use the dedicated RTC
 	  module and leave the RTT available for other uses.)