* SWDEV-558848 - Move DRM calls to thunk for better abstraction
* Use thunk device handle instead of drm inside agent
* Update IPC functions with new thunk calls
* create hsaKmtHandleImport interface to support ipc
* Reset metadata inside hsaKmtMemHandleFree
* remove whitespaces and NULL usage
* Add thunk apis to libhsakmt.ver
* Add comments to new structs in thunk
* Minor fixes to declarations
* resolve merge conflicts in amd_kfd_driver
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Co-authored-by: Rahul Manocha <rmanocha@amd.com>