board: add support for VCC-GND STM32H750VB

[sanpeqf]

YD-STM23H750VB board has 128 Kbytes of flash memory, 1 Mbytes of SRAM and 16 Mbytes onboard SPI norflash.

[github-actions]

Hello @JohnSanpe, and thank you very much for your first pull request to the Zephyr project!
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[erwango]

Thanks for contributing this board.

[kartben]

Ping @erwango

[erwango]

Non blocking: Could be removed.

[github-actions]

Hi @sanpeqf!
Congratulations on getting your very first Zephyr pull request merged 🎉🥳. This is a fantastic achievement, and we're thrilled to have you as part of our community!

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Thank you for your valuable input, and we look forward to seeing more of your contributions in the future! 🪁