Expose optional HSYNC input in LCD_CAM

[Dominaezzz]

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Submission Checklist 📝

• I have updated existing examples or added new ones (if applicable).
• I have used cargo xtask fmt-packages command to ensure that all changed code is formatted correctly.
• My changes were added to the CHANGELOG.md in the proper section.
• My changes are in accordance to the esp-rs API guidelines

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• I have read the CONTRIBUTING.md guide and followed its instructions.

Pull Request Details 📖

Description

There's an optional HSYNC input signal that wasn't exposed, this PR exposes it.

Testing

Ran the modified example

[jessebraham]

These changes look fine to me, however I still don't have access to a devkit to test these changes so I've asked @playfulFence to take a look when he gets a chance. Appreciate your patience!

[playfulFence]

Hello @Dominaezzz!
Sorry for it taking so long!
I've tested your updated version of a driver. And here are some results.
Honestly, I'm not really familiar with this driver, but from the first look both changes and the result looks nice
Let me know if this is an expected output. Also please make sure to rebase your branch

Before fix:

After fix:

[Dominaezzz]

Yes that's what I'm expecting. FF, D8, FF, E0 is how valid JPEGs start.

I'll rebase

[jessebraham]

Thanks, LGTM!