rust: rename qemu-api modules to follow C code a bit more

A full match would mean calling them qom::object and hw::core::qdev.  For now,
keep the names shorter but still a bit easier to find.

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

rust/hw/char/pl011/src/device.rs

@@ -11,10 +11,10 @@ use std::{
 use qemu_api::{
     bindings::{self, *},
     c_str,
-    definitions::ObjectImpl,
-    device_class::DeviceImpl,
     irq::InterruptSource,
     prelude::*,
+    qdev::DeviceImpl,
+    qom::ObjectImpl,
 };
 
 use crate::{