Revert "[securemem] Fix for use-after scope bug in SetPhysicalSecureHeaps"

This reverts commit 3bc92dc3e3f17f39b1555c2707b1659e85d1b436.

Reason for revert: This seems to be causing some securemem problems in smart displays:  https://paste.googleplex.com/6421987821879296 

Original change's description:
> [securemem] Fix for use-after scope bug in SetPhysicalSecureHeaps
> 
> The fit::defer is run after response goes out of scope (because of C++
> destructor invocation order).
> 
> Fixed: 48997
> 
> Change-Id: Idce68a6cb08668cc49fc349c218e7394c9f67279

TBR=bprosnitz@google.com,pascallouis@google.com

Change-Id: I6843a7e1d6945237991558575b4a40ebe89dadea
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
1 file changed
tree: 58014a13679d0e95bdd77db85a26fedb9689d49f
  1. .clang-format
  2. .clang-tidy
  3. .dir-locals.el
  4. .gitattributes
  5. .gitignore
  6. .gn
  7. .style.yapf
  8. AUTHORS
  9. BUILD.gn
  10. CODE_OF_CONDUCT.md
  11. CONTRIBUTING.md
  12. LICENSE
  13. OWNERS
  14. PATENTS
  15. README.md
  16. boards/
  17. build/
  18. bundles/
  19. docs/
  20. examples/
  21. garnet/
  22. products/
  23. rustfmt.toml
  24. scripts/
  25. sdk/
  26. src/
  27. third_party/
  28. tools/
  29. zircon/
README.md

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