Kernel/HID: Add support for virtio input devices (+ use them for RISC-V in run.py) #24254
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This PR makes keyboard and (absolute) mouse input work on RISC-V!
The QEMU virtio keyboard, mouse and tablet (absolute mouse) work on both x86-64 and riscv64.
I only tested the keyboard driver with my german keyboard (+german layout), but that should hopefully not be an issue. I would still appreciate it if someone could test this with a different layout.
We could also consider changing run.py to use the virtio input devices on x86-64 in the future, since those might be a better option than using PS/2 when running in QEMU.
The new virtio driver is not in the Bus/VirtIO directory, as #24152 will move all other virtio drivers out of there.