[HW] Waveshare RP2040-Geek

[rexut]

Is this request related to a missing driver support for a particular hardware platform, SoC or board? Please describe.
Related to #122 I need support for Waveshare's RP2040-Geek board too. 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
Non.