BugLink: http://bugs.launchpad.net/bugs/1546572

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 <Rex.Zhu@amd.com>
Signed-off-by: Jammy Zhou <Jammy.Zhou@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit ba5c2a87)
Signed-off-by: Alberto Milone <alberto.milone@canonical.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>