CXL Mem enable error
Description of problem:
During the process of booting, the following info indicate that the CXL Mem is not enabled.
```
Media not active (-16)
probe of mem0 failed with error -16
```
Steps to reproduce:
1. Compile Linux kernel v5.18 as shown in the QEMU doc
2. Run the above-mentioned script
3. Check the booting script
Additional information:
Could you give me some hints of how to operate on the CXL device properly? Thanks a lot.