Add delimiter for bss command

With the availability of MASK option, the number of lines per BSS is not obvious,
add a delimiter to make parsing less flaky

Bug: 2961159
Change-Id: I9e5523f8da183e0735dbc06f0c09c9f841060504
diff --git a/wpa_supplicant/ctrl_iface.c b/wpa_supplicant/ctrl_iface.c
index 849633a..c703002 100644
--- a/wpa_supplicant/ctrl_iface.c
+++ b/wpa_supplicant/ctrl_iface.c
@@ -2741,6 +2741,13 @@
 	}
 #endif /* CONFIG_INTERWORKING */
 
+#ifdef ANDROID
+	ret = os_snprintf(pos, end - pos, "====\n");
+	if (ret < 0 || ret >= end - pos)
+		return 0;
+	pos += ret;
+#endif
+
 	return pos - buf;
 }