Support for Pico RP2040 HW SPI Channels

**Describe the problem you have/What new integration you would like**

Using SPI to drive displays, all combinations of GPIO pins I've tried do not give HW SPI. Always reverts to SW SPI. The RP2040 supports 2 channels for hardware SPI and would be great to be able to select which channel to use.
ie.
spi:
spi_channel: 0
...

**Please describe your use case for this integration and alternatives you've tried:**

To speed up display interface such as tft displays.
Current performance on screen updates are very slow.

**Additional context**