drm/amd/powerplay: off by one bugs in smu_cmn_to_asic_specific_index()

These tables have _COUNT number of elements so the comparisons should be
>= instead of > to prevent reading one element beyond the end of the
array.

Fixes: 8264ee69 ("drm/amd/powerplay: drop unused code")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>