[HW] Waveshare RP2040

[rexut]

Is this request related to a missing driver support for a particular hardware platform, SoC or board? Please describe.
I need support for Waveshare's RP2040 boards. The following boards should be supported:

• RP2040-One
• RP2040-Zero
• RP2040-Tiny
• RP2040-Matrix
• RP2040-ETH
• RP2040-LCD-0.96
• RP2040-Plus

In this early first stage the Zephyr upstream samples "LED blinky" and "Shell on serial console" should be usable.

Describe why you are asking for this support?
With this support the board variation for RP2040 based systems will scaling up.

I'm preparing a changeset for PR. I'll maintain the new board for Bridle and later contribute and maintain to/in Zephyr upstream.

Additional context
The new board support will coming together with Grove connector support as currently provided by Bridle only.