orion: Advertise support for RTC

Otherwise, we can't select RTC_SUPPORT and the corresponding kmod-rtc-*
packages.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

target/linux/orion/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 ARCH:=arm
 BOARD:=orion
 BOARDNAME:=Marvell Orion
-FEATURES:=broken
+FEATURES:=broken rtc
 SUBTARGETS:=generic harddisk
 MAINTAINER:=Imre Kaloz <kaloz@openwrt.org>