UBUNTU-CVE-2026-93081: Low severity ubuntu/linux-hwe-edge vulnerability

In the Linux kernel, the following vulnerability has been resolved: firmware: armscmi: Fix SCMI device destroy lifetimes scmichilddevfind() drops the reference returned by devicefindchild() before returning the scmidevice pointer. A concurrent unregister can then release the device while the destroy path is still using the returned pointer. Make the lookup helper return the devicefindchild() reference and keep it until scmidevicedestroy() has finished unregistering the child. Also split deviceunregister() in scmidevicedestroy() so the SCMI bus ID is not made reusable until after devicedel() has removed the old scmidev.N name from sysfs. This avoids a new SCMI device reusing the same ID while the old device is still registered. The final device release callback is also a possible cleanup path when SCMI children are deleted by driver core recursion rather than scmidevicedestroy(). Release the SCMI bus ID from a common helper used by destroy, register-failure and final-release paths, and clear scmidev->id after freeing it so the final release cannot free the same ID again.