dev-qemu: Add minimal tasks for completing HID handshake

[kurtjd]

Updates dev-qemu to have a couple basic tasks that can complete the initial HID over i2c handshake that Windows will typically do on startup.

This it mainly to support the odp-platform-qemu-arm repo so that we can verify the Windows qemu instance can always successfully talk to the EC qemu instance and also serves as a basic example for further HIDI2C development within the qemu ec.

[Copilot]

Pull request overview

Adds a minimal HID-over-I2C implementation to the dev-qemu platform so a host (notably Windows) can complete the initial HID handshake during startup, enabling more reliable EC↔host comms validation in QEMU-based setups.

Changes:

• Spawns new HID host/device Embassy tasks from dev-qemu’s main.
• Introduces a minimal HID-over-I2C device implementation (descriptor + report descriptor + basic command acks).
• Extends the QEMU board abstraction with an I2C target peripheral and an active-low GPIO “interrupt” line, plus required dependency updates.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
platform/dev-qemu/src/main.rs	Wires up and spawns the new HID host/device tasks during boot.
platform/dev-qemu/src/hid.rs	Implements the minimal HID-over-I2C handshake behavior and task loops.
platform/dev-qemu/src/board.rs	Adds I2C target + GPIO interrupt line to the board bring-up.
platform/dev-qemu/Cargo.toml	Adds HID-related dependencies and updates cargo-machete ignores.
platform/dev-qemu/Cargo.lock	Locks new dependency graph entries introduced by HID support.