[OpenMP][AMDGPU] Switch host-device memory copy to asynchronous version
Prepare amdgpu plugin for asynchronous implementation. This patch switches to using HSA API for asynchronous memory copy. Moving away from hsa_memory_copy means that plugin is responsible for locking/unlocking host memory pointers. Reviewed By: JonChesterfield Differential Revision: https://reviews.llvm.org/D115279
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