drm/amdkfd: correct sdma queue number of sdma 6.0.1

sdma 6.0.1 has 8 queues instead of 2.

Fixes: 26776a70 ("drm/amdkfd: add GC 11.0.1 KFD support")
Signed-off-by: Yifan Zhang <yifan1.zhang@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Tim Huang <Tim.Huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>