The S32K322 does not include a module named 'PPU'. If you're referring to peripheral access protection, this is managed through the XRDC (Extended Resource Domain Controller), which allows you to configure access rights for peripherals and memory regions across the dual-core setup. Let us know if you were referring to a different concept or platform.
Example code you may find within RTD:

RM_Example.. shows also XRDC setup example, Platform_.. contains MPU setup example