Add wpa_supplicant update to core28

diff --git a/config/rootfiles/core/28/filelists/wpa_supplicant b/config/rootfiles/core/28/filelists/wpa_supplicant
new file mode 120000 (symlink)
index 0000000..1d04c03
--- /dev/null
+++ b/config/rootfiles/core/28/filelists/wpa_supplicant
@@ -0,0 +1 @@
+../../../common/wpa_supplicant
\ No newline at end of file