Hello,
I do not know if you try to add the driver, the code driver is not added by the MCUXpresso config tool.
1- In your project click right and then when the popup window appears go to SDK management.

2- In SDK management select the Manage SDK Component another popup windows will appears.

3- Select the option of Drivers [yellow mark].

4- Type the driver you need to add, select and click OK.

If you need more information please let me know.
Best regards,
Pavel