dep: Rely on latest kvm-ioctls crate

In order to have access to the newly added signal_msi() function
from the kvm-ioctls crate, this commit updates the version of the
kvm-ioctls to the latest one.

Because set_user_memory_region() has been swtiched to "unsafe", we
also need to handle this small change in our cloud-hypervisor code
directly.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

arch/Cargo.toml

@@ -6,7 +6,7 @@ authors = ["The Chromium OS Authors"]
 [dependencies]
 byteorder = "=1.2.1"
 kvm-bindings = "0.1"
-kvm-ioctls = "0.1.0"
+kvm-ioctls = { git = "https://github.com/rust-vmm/kvm-ioctls", branch = "master" }
 libc = ">=0.2.39"
 
 arch_gen = { path = "../arch_gen" }