Added some Waveshare board support

[waveshare]

Added some weveshare board support,PTAL.

[lurch]

@waveshare Apologies for the delay in getting round to reviewing this.
My check_board_header.py script doesn't report any problems with any of these new header files 👍

However if I compare the waveshare_rp2350_one.h in this PR to the one in #2174 , I can see that your PR says that RP2350-One has:

// no PICO_DEFAULT_WS2812_PIN

but the version in #2174 says:

// --- WS2812 ---
#ifndef PICO_DEFAULT_WS2812_PIN
#define PICO_DEFAULT_WS2812_PIN 16
#endif

and https://www.waveshare.com/wiki/RP2350-One#Pinout_Definition also says that there's a WS2812 connected to GP16 ? 🤔
Also, the version in this PR says

#define PICO_DEFAULT_SPI_RX_PIN 16

but your pinout diagram seems to show that GP16 isn't available on any of the user-accessible pins?

[waveshare]

Sorry, this is our mistake, #2174 is right, we will fix it soon
GP16 is only used for WS2812

[waveshare]

Hello,
After a long wait, we have corrected the corresponding pin definitions.Please take a look.

[lurch]

Thanks for the updates, my check_board_header.py now doesn't report any problems 👍

However I see that in various different files you've defined:

WAVESHARE_RP2040_TOUCH_LCD_SPI
WAVESHARE_RP2350_TOUCH_LCD_SPI
WAVESHARE_RP2350_LCD_SPI

(along with the associated pin-defines for each of those SPI interfaces).
You obviously know your own hardware much better than I do, but is there a reason for all these different names, or might it makes sense to just name them all WAVESHARE_LCD_SPI ?

Similarly, perhaps it would make sense for both

WAVESHARE_RP2040_BAT_ADC_PIN
WAVESHARE_RP2350_BAT_ADC_PIN

to be named just WAVESHARE_BAT_ADC_PIN ?

These suggestions are entirely optional; if you disagree I'm happy to approve this PR as-is.

[waveshare]

I think your suggestion is very good. Give me some time and I will solve it.

[waveshare]

Please take a look.

[lurch]

Fantastic 👍

Thank you for taking my comments into account, and thank you so much for adding all these board headers! ❤️