Add RTC support for Merisc boards

This patch adds RTC support for the Merisc boards.

Signed-off-by: Jonas Larsson <jonas.larsson@martinsson.se>
Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
diff --git a/arch/avr32/configs/merisc_defconfig b/arch/avr32/configs/merisc_defconfig
index cd51459..41554db 100644
--- a/arch/avr32/configs/merisc_defconfig
+++ b/arch/avr32/configs/merisc_defconfig
@@ -887,7 +887,7 @@
 # CONFIG_RTC_DRV_RS5C372 is not set
 # CONFIG_RTC_DRV_ISL1208 is not set
 # CONFIG_RTC_DRV_X1205 is not set
-# CONFIG_RTC_DRV_PCF8563 is not set
+CONFIG_RTC_DRV_PCF8563=y
 # CONFIG_RTC_DRV_PCF8583 is not set
 # CONFIG_RTC_DRV_M41T80 is not set
 # CONFIG_RTC_DRV_S35390A is not set