Fix for PCIe to libfabric mapping for CXI provider (#1416)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit

* **New Features**
* Device topology discovery and mapping now include CXI devices
alongside EFA.

* **Improvements**
* Validation logic generalized to run provider-aware checks for multiple
providers.
* Provider initialization tuned for better detection and compatibility.
* Mapping initialization now retries when advanced memory features are
unavailable to improve robustness.

* **Behavior**
* EFA-specific validation runs only for EFA; other providers skip that
step with a logged notice.
  * CXI device discovery now reports device counts in logs.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Co-authored-by: Subhra Sankar Kalita <subhra-sankar.kalita@hpe.com>
Co-authored-by: Ryan Hankins <ryan.hankins@hpe.com>