ar71xx: EPG5000 requires ATH79_NVRAM

EPG5000 uses ath79 nvram functions, but does not select it. This breaks
build if no other board support enabling nvram support is selected.

Closes #19952.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@46190 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/ar71xx/patches-3.18/718-MIPS-ath79-add-EPG5000-support.patch

 --- a/arch/mips/ath79/Kconfig
 +++ b/arch/mips/ath79/Kconfig
-@@ -196,6 +196,16 @@ config ATH79_MACH_F9K1115V2
+@@ -196,6 +196,17 @@ config ATH79_MACH_F9K1115V2
  	select ATH79_DEV_USB
  	select ATH79_DEV_WMAC
  
@@ -13,6 +13,7 @@
 +	select ATH79_DEV_M25P80
 +	select ATH79_DEV_USB
 +	select ATH79_DEV_WMAC
++	select ATH79_NVRAM
 +
  config ATH79_MACH_ESR1750
  	bool "EnGenius ESR1750 board support"