EHCI: fix xfer failed with disconnected device as stalled

- change CFG_TUH_ENDPOINT_MAX to 16 (max endpoint pair per device) if
not defined
- change QHD_MAX for EHCI, should be user configurable and more
optimized in the future

examples/host/cdc_msc_hid/src/hid_app.c

@@ -263,7 +263,7 @@ static void process_generic_report(uint8_t dev_addr, uint8_t instance, uint8_t c
 
   if (!rpt_info)
   {
-    printf("Couldn't find the report info for this report !\r\n");
+    printf("Couldn't find report info !\r\n");
     return;
   }