Create simpler wrapper for reboot_device so I can just set the maxchanends in that.

module_usb_aud_shared/reboot.xc

@@ -0,0 +1,20 @@
+#include <xs1.h>
+#include <print.h>
+
+int write_sswitch_reg_blind(unsigned coreid, unsigned reg, unsigned data);
+
+/* Reboots XMOS device by writing to the PLL config register */
+void device_reboot_implementation(chanend spare) 
+{
+    outct(spare, XS1_CT_END); // have to do this before freeing the chanend
+    inct(spare); // Receive end ct from usb_buffer to close down in both directions
+    // Need a spare chanend so we can talk to the pll register
+    asm("freer res[%0]"::"r"(spare));
+    {
+       unsigned int pllVal;
+       unsigned int core_id = get_core_id();
+       read_sswitch_reg(core_id, 6, pllVal);
+       write_sswitch_reg_blind(core_id^0x8000, 6, pllVal);
+       write_sswitch_reg_blind(core_id, 6, pllVal);
+    }
+}