Print the status out when it passes, and also tell user gpu reset
is triggered when we fall back to legacy way.

v2: make the message more explicit.
v3: change succeeds to succeeded.
    replace pr_warn with dev_warn.
Signed-off-by: Tao Zhou <tao.zhou1@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>