drm/amdgpu/powerplay/vega10: fix typo in register base index

Probably a copy pasta.  No functional difference, both have
the same value.
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reported-by: Michael von Khurja <mvonkhurja@techpowerup.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/hwmgr/vega10_thermal.c

@@ -374,7 +374,7 @@ int vega10_thermal_get_temperature(struct pp_hwmgr *hwmgr)
 	uint32_t reg;
 
 	reg = soc15_get_register_offset(THM_HWID, 0,
-			mmCG_TACH_STATUS_BASE_IDX,  mmCG_MULT_THERMAL_STATUS);
+			mmCG_MULT_THERMAL_STATUS_BASE_IDX,  mmCG_MULT_THERMAL_STATUS);
 
 	temp = cgs_read_register(hwmgr->device, reg);