drm/amd/pm:Fix GFX deep sleep clock reporting

For SMU v13.0.6, keep GFX deep sleep clock reporting style consistent
with that of other clocks. Sample format below.

S: 78Mhz *
0: 600Mhz
1: 800Mhz

Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>