ezusb: decouple some nodes from ezusb-iidx-emu

This fixes a build failure in newer gcc for popnhook.
Since node-16seg has a dependency on iidxio

src/main/ezusb-emu/node-none.c

@@ -0,0 +1,19 @@
+#include "ezusb-emu/node-none.h"
+
+uint8_t ezusb_iidx_emu_node_none_process_cmd(
+    uint8_t cmd_id, uint8_t cmd_data, uint8_t cmd_data2)
+{
+    return 0;
+}
+
+bool ezusb_iidx_emu_node_none_read_packet(
+    struct ezusb_iidx_msg_bulk_packet *pkg)
+{
+    return true;
+}
+
+bool ezusb_iidx_emu_node_none_write_packet(
+    const struct ezusb_iidx_msg_bulk_packet *pkg)
+{
+    return true;
+}