Revalidate devices when auto switching mps to cpu

[martinkim0]

• Closes #xxxx (Replace xxxx with the GitHub issue number)
• Tests added and passed if fixing a bug or adding a new feature
• All code checks passed.
• Added type annotations to new arguments/methods/functions.
• Added an entry in the latest docs/release_notes/index.md file if fixing a bug or adding a new feature.
• If the changes are patches for a version, I have added the on-merge: backport to x.x.x label.

[codecov]

Codecov Report

Patch coverage: 40.00% and project coverage change: -0.02% ⚠️

Comparison is base (de59581) 89.10% compared to head (c6de73c) 89.09%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2247      +/-   ##
==========================================
- Coverage   89.10%   89.09%   -0.02%     
==========================================
  Files         145      145              
  Lines       11815    11817       +2     
==========================================
  Hits        10528    10528              
- Misses       1287     1289       +2     

Files Changed	Coverage Δ
scvi/model/_utils.py	89.04% <40.00%> (-1.24%)	⬇️

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