amdgpu/pm: reorder definition of swsmu_pm_funcs for readability

Match the order of definition to the structure's declaration to
help with locating included and missing functions of the API

Signed-off-by: Darren Powell <darren.powell@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>