drm/amdgpu: disable legacy path of firmware check if powerplay is enabled

Powerplay will use a different interface once it's integrated.  These
legacy pathes will be removed once powerplay is enabled by default.

Signed-off-by: Rex Zhu <[email protected]>
Signed-off-by: Jammy Zhou <[email protected]>
Reviewed-by: Alex Deucher <[email protected]>
2 files changed