rust: device: HACK? make parent() public

Signed-off-by: Janne Grunau <j@jannau.net>

Author: jannau

rust/kernel/device.rs

@@ -339,7 +339,7 @@ impl<Ctx: DeviceContext> Device<Ctx> {
 
     /// Returns a reference to the parent device, if any.
     #[cfg_attr(not(CONFIG_AUXILIARY_BUS), expect(dead_code))]
-    pub(crate) fn parent(&self) -> Option<&Device> {
+    pub fn parent(&self) -> Option<&Device> {
         // SAFETY:
         // - By the type invariant `self.as_raw()` is always valid.
         // - The parent device is only ever set at device creation.