add wrapper, si_usb.h, clean up si_usb a little, and use wrapper

rs485hid/rs485gw.c

@@ -24,7 +24,7 @@
  *
  */
 
-#include <usbd_cdc_if.h>
+#include <si_usb.h>
 
 #include <misc.h>
 

si_usb.c

@@ -6,7 +6,6 @@
 
 #include <usb_device.h>
 
-#if 1
 static void
 usb_cdc_init(const void *foo)
 {
@@ -24,5 +23,4 @@ USB_LP_IRQHandler(void)
 	HAL_PCD_IRQHandler(&hpcd_USB_FS);
 }
 
-SYSINIT(abkdkd, SI_SUB_CONSOLE, SI_ORDER_FIRST, usb_cdc_init, NULL);
-#endif
+SYSINIT(usb_cdc_init, SI_SUB_CONSOLE, SI_ORDER_FIRST, usb_cdc_init, NULL);

si_usb.h

@@ -0,0 +1,8 @@
+
+/*
+ * defines FILE *vcp_usb, usb_printf and vcp_status
+ *
+ * vcp_status returns if host has set DTR (presence) or not.
+ */
+#include <usbd_cdc_if.h>
+