drm/amd/display: Change pstate expected timeout warning to 180us on linux

[Why]
There is a warning that triggers when pstate takes too long.
Pstate can take up to ~200us on Linux without hanging but
it is currently set to 40us.

[How]
Change the timeout for the warning to be 180us on Linux.

Signed-off-by: Victor Lu <victorchengchi.lu@amd.com>
Reviewed-by: Roman Li <Roman.Li@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>