misc: Fix missing lifetime syntax clippy warning

This was caught by the nightly compiler during cargo fuzz build.

error: lifetime flowing from input to output with different syntax can be confusing
   --> /home/runner/work/cloud-hypervisor/cloud-hypervisor/hypervisor/src/arch/x86/emulator/mod.rs:493:26
    |
493 |     pub fn new(platform: &mut dyn PlatformEmulator<CpuState = T>) -> Emulator<T> {
    |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^     ----------- the lifetime gets resolved as `'_`
    |                          |
    |                          this lifetime flows to the output
    |
    = note: `-D mismatched-lifetime-syntaxes` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(mismatched_lifetime_syntaxes)]`
help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
    |
493 |     pub fn new(platform: &mut dyn PlatformEmulator<CpuState = T>) -> Emulator<'_, T> {

Signed-off-by: Jinank Jain <jinankjain@microsoft.com>

virtio-devices/src/vsock/mod.rs

@@ -286,7 +286,7 @@ pub mod tests {
             }
         }
 
-        pub fn create_epoll_handler_context(&self) -> EpollHandlerContext {
+        pub fn create_epoll_handler_context(&self) -> EpollHandlerContext<'_> {
             const QSIZE: u16 = 2;
 
             let guest_rxvq = GuestQ::new(GuestAddress(0x0010_0000), &self.mem, QSIZE);