Cherry pick "Refactor: Use physical pointer abstraction in LVBS"#1022
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This PR lets the LVBS platform (i.e., HEKI/HVCI) use physical pointer abstraction to access VTL0 memory. This is equivalent to the OP-TEE shim's normal-world memory access such that it is not only safer than the legacy VTL0 memory copy functions (i.e., `copy_(slice_)(from|to)_vtl0_phys`) but also supporting virtually contiguous access of non-contiguous physical page frames. --------- Co-authored-by: Sangho Lee <sanghle@microsoft.com>
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