drm/amdkfd: Adjust three kfd dmesg printings during initialization

Delete two printings which are not very useful, and change one from
pr_info() to pr_debug().

Signed-off-by: Yong Zhao <Yong.Zhao@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>