amdgpu/test: Disable deadlock tests for all non gfx8/9 ASICs.

Since only for those ASICs gpu reset is enabled by deafult.
Also update disable message and fix identation .

Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>