The SPI driver has HW attributes defined for all 11 instances of McSPI (3 MCU + 8 Main). But, only exposes 5 instances (3 MCU + 2 main) through the SPI_open function call. The SPI open API just take a parameter for instance index, 0-2 are returned as MCU MCSPI 0-2; 3-4 are returned as MAIN MCSPI 3-4. Need to add a "domain" parameter to SPI_open to support all 11 instances.

All 11 instances are supported through MCSPI_open and user can use the same as a workaround