add hcd_ehci.h as interface for ehci port

src/portable/nxp/transdimension/hcd_transdimension.c

@@ -43,6 +43,7 @@
 
 #include "common/tusb_common.h"
 #include "common_transdimension.h"
+#include "portable/ehci/hcd_ehci.h"
 
 //--------------------------------------------------------------------+
 // MACRO CONSTANT TYPEDEF
@@ -75,9 +76,6 @@ typedef struct
   };
 #endif
 
-// TODO better prototype later
-extern bool hcd_ehci_init (uint8_t rhport); // from ehci.c
-
 //--------------------------------------------------------------------+
 // Controller API
 //--------------------------------------------------------------------+