[ARM] Orion: enable CONFIG_RTC_DRV_S35390A in the defconfg for QNAP devices

The QNAP TS-109/TS-209 and TS-409 devices need RTC_DRV_S35390A.
Signed-off-by: Martin Michlmayr <tbm@cyrius.com>
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>

arch/arm/configs/orion5x_defconfig

@@ -1122,7 +1122,7 @@ CONFIG_RTC_DRV_PCF8563=y
 # CONFIG_RTC_DRV_PCF8583 is not set
 CONFIG_RTC_DRV_M41T80=y
 # CONFIG_RTC_DRV_M41T80_WDT is not set
-# CONFIG_RTC_DRV_S35390A is not set
+CONFIG_RTC_DRV_S35390A=y
 
 #
 # SPI RTC drivers