[IFRT] Don't populate the pjrt_device() field of PJRT-IFRT devices for non-addressable devices.
[IFRT] Don't populate the pjrt_device() field of PJRT-IFRT devices for non-addressable devices.

Change in preparation for removing knowledge of non-addressable devices from PJRT in many cases. In the future, only IFRT should know about devices outside the current process. This change removes any access to those PJRT devices via IFRT.
