[ARM] Orion: enable CONFIG_RTC_DRV_M41T80 for D-Link DNS-323

The D-Link DNS-323 uses a M41T80 RTC chip, so enable this driver in
the Orion defconfig.

Signed-off-by: Martin Michlmayr <tbm@cyrius.com>
Cc: Herbert Valerio Riedel <hvr@gnu.org>
Acked-by: Nicolas Pitre <nico@marvell.com>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/configs/orion_defconfig

@@ -1108,7 +1108,7 @@ CONFIG_RTC_DRV_RS5C372=y
 # CONFIG_RTC_DRV_X1205 is not set
 # CONFIG_RTC_DRV_PCF8563 is not set
 # CONFIG_RTC_DRV_PCF8583 is not set
-# CONFIG_RTC_DRV_M41T80 is not set
+CONFIG_RTC_DRV_M41T80=y
 # CONFIG_RTC_DRV_M41T80_WDT is not set
 
 #