x86: fix typo in alix2/net5501 default packages

git-svn-id: svn://svn.openwrt.org/openwrt@34972 3c298f89-4303-0410-b956-a3cf2f4a3e73
x86: fix typo in alix2/net5501 default packages

Backport of r34972

git-svn-id: svn://svn.openwrt.org/openwrt@34973 3c298f89-4303-0410-b956-a3cf2f4a3e73