SPI Features: SPI Modes, multiple Subs

### Motivation

Adding support for SPI Modes (Clock Polarity (CPOL) and Clock Phase (CPHA)) would be allow for changing to alternative SPI Modes. Current SPI Mode is just SPI Mode 0.

As well as add support for multiple Subs.

### Desired solution

Add CPOL/CPHA configuration in SPI gaskets, and BFMs
Add multiple CS line configuration in SPI gaskets and BFMs

### Alternatives considered

_No response_

### Additional details

_No response_