refactor(usb): Rename mock class files

- Rename "test_usb_mock_..." class files to "mock_..."
- Fixed some codespell issues
- Fixed comment spacing

components/usb/test_apps/hcd/main/test_app_main.c

@@ -20,7 +20,7 @@ void setUp(void)
 
 void tearDown(void)
 {
-    //Short delay to allow task to be cleaned up
+    // Short delay to allow task to be cleaned up
     vTaskDelay(10);
     test_hcd_teardown(port_hdl);
     port_hdl = NULL;