* Introduce HsaKFDContext structure and infrastructure for multiple KFD contexts, enabling
independent contexts within a single process.
* Refactor core components (queue, event, FMM, topology) to be context-aware,
using explicit HsaKFDContext parameters instead of global state.
* Replace global hsakmt_kfd_fd with context-specific file descriptors, ensuring full context isolation.
* Maintain backward compatibility by redirecting legacy APIs to use the primary context.
This refactoring establishes a foundation for multi-context support while preserving existing functionality.
Signed-off-by: Junhua Shen <Junhua.Shen@amd.com>