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modesetting: Disable reverse prime offload mode for displays running on evdi,udl displays.

Łukasz Spintzyk requested to merge Spintzyk/xserver:disable_reverse_prime_for_evdi into master

This is fix for #1183 (closed)

This mode for displays running on evdi/udl as side effect of failed glamor_egl_init reverse_prime_offload_mode was initialized to FALSE

After Mesa upgrade to 21.0.0 GL_RENDERER is not llvmpipe that results in successful glamor_egl_init and reverse_prime_offload_mode enabled.

This commit is explicitly disabling reverse_prime_offload_mode for evdi and udl drivers

Edited by Łukasz Spintzyk

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