drm/amd/powerplay: correct arcturus current clock level calculation

There may be 1Mhz delta between target and actual frequency. That
should be taken into consideration for current level check.

Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Kenneth Feng <kenneth.feng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
1 file changed