rename HCD_MAX_XFER to CFG_TUH_ENDPOINT_MAX

minor clean up

src/portable/raspberrypi/rp2040/rp2040_usb.c

@@ -58,6 +58,7 @@ void rp2040_usb_init(void)
   unreset_block_wait(RESETS_RESET_USBCTRL_BITS);
 
   // Clear any previous state just in case
+  // TODO Suppress warning array-bounds with gcc11
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Warray-bounds"
   memset(usb_hw, 0, sizeof(*usb_hw));