rename generic-2.6/config-default to generic-2.6/config-2.6.21

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@12637 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/target/linux/generic-2.6/config-default b/target/linux/generic-2.6/config-2.6.21
similarity index 100%
rename from target/linux/generic-2.6/config-default
rename to target/linux/generic-2.6/config-2.6.21