1. add phy_printf into libcore 2. update libphy.a which has important optimization for ht40 traffic
@@ -1 +1 @@
-Subproject commit a580f70a64872a7cc291b1f22455f6adbc2e35cf
+Subproject commit ea9c156e8a67d27623eab6f98ce5a55a00c8fb19