Created xua_buffer.h.

Added dummy hw config calls to simple app.
Tmp added gpio_access

examples/app_xua_simple/src/hwsupport.xc

@@ -0,0 +1,20 @@
+// Copyright (c) 2016, XMOS Ltd, All rights reserved
+
+#include <platform.h>
+#include "audiohw.h"
+#include "customdefines.h"
+#include "gpio_access.h"
+
+
+void AudioHwConfig(unsigned samFreq, unsigned mClk, chanend ?c_codec, unsigned dsdMode,
+    unsigned sampRes_DAC, unsigned sampRes_ADC)
+{
+  // nothing
+}
+
+void AudioHwInit(chanend ?c_codec)
+{
+    set_gpio(P_GPIO_USB_SEL0, 1);
+    set_gpio(P_GPIO_USB_SEL1, 1);
+}
+