drm/amd/display: [FW Promotion] Release 0.1.5.0

Aligning dmub_cmd header with dmu firmware release 0.1.5.0

Signed-off-by: Taimur Hassan <Syed.Hassan@amd.com>
Signed-off-by: Roman Li <roman.li@amd.com>
Reviewed-by: Zaeem Mohamed <zaeem.mohamed@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>