pp_soc15.h is vega10 specific. Update powerplay code to use soc15 common
macros defined in soc15_common.h.
Signed-off-by: NEvan Quan <evan.quan@amd.com>
Reviewed-by: NRex Zhu <Rex.Zhu@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>