mako: add supplicant config overlay

Change-Id: Ib419f3f361938897e7c307e4e3f1c286d716d84a
Signed-off-by: Iliyan Malchev <malchev@google.com>
diff --git a/wpa_supplicant_overlay.conf b/wpa_supplicant_overlay.conf
new file mode 100644
index 0000000..15200d8
--- /dev/null
+++ b/wpa_supplicant_overlay.conf
@@ -0,0 +1 @@
+p2p_no_group_iface=1