fix: utils: addr: add missing methods

lib/utils/src/addr.rs

@@ -423,3 +423,19 @@ impl Step for VirtAddr {
         start.as_usize().checked_sub(count).map(VirtAddr)
     }
 }
+
+impl PhysAddr {
+    /// # Safety
+    /// Only provided for the sake of completeness. Use `{mmap, kernel}_phys_to_virt` instead.
+    pub unsafe fn to_virt_addr(&self) -> VirtAddr {
+        VirtAddr(self.0)
+    }
+}
+
+impl VirtAddr {
+    /// # Safety
+    /// Only provided for the sake of completeness. Use `{mmap, kernel}_virt_to_phys` instead.
+    pub unsafe fn to_phys_addr(&self) -> PhysAddr {
+        PhysAddr(self.0)
+    }
+}