downgrade using to typedef (api 21/22 build fix)

Change-Id: I0310d29aed1bcd8642f29b8ddb10e0d546a6df59
diff --git a/system/OpenglSystemCommon/HostConnection.cpp b/system/OpenglSystemCommon/HostConnection.cpp
index 5476362..f96d3e3 100644
--- a/system/OpenglSystemCommon/HostConnection.cpp
+++ b/system/OpenglSystemCommon/HostConnection.cpp
@@ -53,7 +53,7 @@
 };
 } // namespace goldfish_vk
 class QemuPipeStream;
-using AddressSpaceStream = QemuPipeStream;
+typedef QemuPipeStream AddressSpaceStream;
 AddressSpaceStream* createAddressSpaceStream(size_t bufSize) {
     ALOGE("%s: FATAL: Trying to create ASG stream in unsupported build\n", __func__);
     abort();