[host lpc43xx] adding support for host custom class

refractor usbh class driver indexing
opt out periodic list code in EHCI (need to refractor/group later)
[device lpc176x] rename dcd_endpoint_configure to dcd_pipe_open
add usbd_pipe_open to manage pipe

tinyusb/tusb.h

@@ -59,15 +59,19 @@
 #if MODE_HOST_SUPPORTED
   #include "host/usbh.h"
 
-  #ifdef HOST_CLASS_HID
+  #if HOST_CLASS_HID
     #include "class/hid_host.h"
   #endif
 
-  #define HOST_CLASS_MSC
+//  #define HOST_CLASS_MSC // FIXME hack to test massstorage class
   #ifdef HOST_CLASS_MSC
     #include "class/msc_host.h"
   #endif
 
+  #if TUSB_CFG_HOST_CUSTOM_CLASS
+    #include "class/custom_class.h"
+  #endif
+
 #endif
 
 //------------- DEVICE -------------//