Update to Zephyr v4.0.0 so we can use the zephyr,touch chosen device tree entry
#7189
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This gives us access to the new `zephyr,touch` device tree entry, which will allow us to produce a more generic touch input handler. INPUT_CALLBACK_DEFINE and the input callback now require `void *` argument for user data. For now we leave this unused.
Zephyr have recently added this device tree entry to provide a common interface for input handlers. This means we can remove the overlay required for the i.MX RT1170 shield, and remove our modifications some of our modifications for the native sim. It also means that we don't have to make device tree modifications to support other boards in the future.
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This removes the need for a custom shield overlay, as the touch device supported by Zephyr (if one exists) is now chosen with a standard name in the device tree. This simplifies adding Slint/Zephyr support for other boards.