bsp/imxrt: Update support library from mcux-sdk

This imports new files from the mcux-sdk support library. NXP now offers
the library as a git repository instead of a zip package. The git
repository supports multiple CPUs from the i.MXRT family:

  https://github.com/nxp-mcuxpresso/mcux-sdk.git

The imported files are from revision

  2b9354539e6e4f722749e87b0bdc22966dc080d9

This revision is the same as MCUXpresso 2.13.0 with small bug fixes.

For importing the files, a script has been used, that parses the
mcux-sdk cmake files and creates the yaml files for RTEMS:

https://raw.githubusercontent.com/c-mauderer/nxp-mcux-sdk/d21c3e61eb8602b2cf8f45fed0afa50c6aee932f/export_to_RTEMS.py