Delete old driver files

[mmahadevan108]

Prerequisites

• [X] I have checked latest main branch and the issue still exists.
• [X] I did not see it is stated as known-issue in release notes.
• [X] No similar GitHub issue is related to this change.
• [X] My code follows the commit guidelines of this project.
• [X] I have performed a self-review of my own code.
• [ ] My changes generate no new warnings.
• [ ] I have added tests that prove my fix is effective or that my feature works.

Describe the pull request

The driver files inside flexcomm and flexio have moved to sub-folders. Delete the older driver files and update the cmake files to use the updated drivers.

Type of change

Bug fix (non-breaking change which fixes an issue)

[mmahadevan108]

cc @mcuxsusan

[mcuxsusan]

Hi @mmahadevan108, thanks for the contribution, the change is OK. The driver folder structure changed from 2.14.0 so there's legacy and new driver co-exists issue. And there's a significant change in 2.14.0 that you may need to take care of for integration: We do not generate individual component cmake files, now up layer project is suggested to include the device specific all_device_lib and integrate kconfig to add/delete component and handle the component dependencies.

[mmahadevan108]

Thank you Susan for updating me.