vm-allocator: Add an allocator KVM memory slots

Add an allocator for KVM memory slots, a finite resource in the kernel
- these need to be manipulated across different crates with a common
dependency

vm-allocator: Add an allocator KVM memory slots

Add an allocator for KVM memory slots, a finite resource in the kernel
- these need to be manipulated across different crates with a common
dependency on this crate.

Signed-off-by: Rob Bradford <rbradford@rivosinc.com>

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