build: drop an invalid dependency in fuzz

The cloud-hypervisor package does not have a lib target, so it is
invalid. Cargo just ignores that line.

Dropping it removes a warning.

Signed-off-by: Wei Liu <liuwe@microsoft.com>

fuzz/Cargo.toml

@@ -31,9 +31,6 @@ vm-virtio = { path = "../vm-virtio" }
 vmm = { path = "../vmm", features = ["guest_debug"] }
 vmm-sys-util = "0.12.1"
 
-[dependencies.cloud-hypervisor]
-path = ".."
-
 # Prevent this from interfering with workspaces
 [workspace]
 members = ["."]