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/qemu-api/meson.build

@@ -19,11 +19,12 @@ _qemu_api_rs = static_library(
       'src/bitops.rs',
       'src/cell.rs',
       'src/c_str.rs',
-      'src/definitions.rs',
-      'src/device_class.rs',
       'src/irq.rs',
+      'src/module.rs',
       'src/offset_of.rs',
       'src/prelude.rs',
+      'src/qdev.rs',
+      'src/qom.rs',
       'src/sysbus.rs',
       'src/vmstate.rs',
       'src/zeroable.rs',