vmm: Address Rust 1.51.0 clippy issue (upper_case_acroynms)

warning: name `LocalAPIC` contains a capitalized acronym
   --> vmm/src/cpu.rs:197:8
    |
197 | struct LocalAPIC {
    |        ^^^^^^^^^ help: consider making the acronym lowercase, except the initial letter: `LocalApic`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#upper_case_acronyms

Signed-off-by: Rob Bradford <robert.bradford@intel.com>

vmm/src/lib.rs

@@ -143,7 +143,7 @@ pub enum Error {
 
     /// Error creating API server
     #[error("Error creating API server {0:?}")]
-    CreatingAPIServer(micro_http::ServerError),
+    CreateApiServer(micro_http::ServerError),
 }
 pub type Result<T> = result::Result<T, Error>;