drm/amdgpu: Set skip_tmr to true for psp v15_0_8
psp v15_0_8 does not require tmr created by gpu driver
Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Likun Gao <Likun.Gao@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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