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radeonsi: tmz support

Pierre-Eric Pelloux-Prayer requested to merge pepp/mesa:radeonsi_tmz_support into master

This MR implements Trusted Memory Zone (TMZ) support for radeonsi.

It requires an updated libdrm version for AMDGPU_IB_FLAGS_SECURE and AMDGPU_GEM_CREATE_ENCRYPTED definitions.

Usage of TMZ is controlled via the AMD_DEBUG=tmz environment variable.

To use this on Wayland the commit from !4049 (closed) is required.

Edited by Pierre-Eric Pelloux-Prayer

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