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

This is port of fix for #1183 (closed) to xserver-1.20-branch

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

Signed-off-by: Łukasz Spintzyk (cherry picked from commit 7e7c1471)

Edited by Łukasz Spintzyk

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