ixp4xx/apex: Fixed another patch name

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@10659 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/target/linux/ixp4xx/image/apex/patches/120-openwrt-nslu2-16mb-armeb_config.patch b/target/linux/ixp4xx/image/apex/patches/120-openwrt_nslu2_16mb_armeb_config.patch
similarity index 100%
rename from target/linux/ixp4xx/image/apex/patches/120-openwrt-nslu2-16mb-armeb_config.patch
rename to target/linux/ixp4xx/image/apex/patches/120-openwrt_nslu2_16mb_armeb_config.patch