[Cherry-pick for 7.2.1] Samples - rocdecdecode CMakeLists cleanup and filesystem fixes

[AryanSalmanpour]

Motivation

rocdecdecode CMakeLists cleanup and filesystem fixes

Technical Details

It fixes the filesystem issue for SLES.

Test Plan

rocdecode CTEST

Test Result

rocdecode CTEST should pass.

Submission Checklist

• Look over the contributing guidelines at https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Additional details and impacted files

@@                   Coverage Diff                    @@
##           release/rocm-rel-7.2     #695      +/-   ##
========================================================
- Coverage                 88.16%   87.92%   -0.23%     
========================================================
  Files                        28       28              
  Lines                     10614    10656      +42     
========================================================
+ Hits                       9357     9369      +12     
- Misses                     1257     1287      +30     

see 3 files with indirect coverage changes

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[JeniferC99]

manual psdb: http://rocm-ci.amd.com/job/compute-rocm-dkms-component-baas-rel/133/