drm/amd/powerplay: maximum code sharing on sensor reading

Move the common code to amdgpu_smu.c instead of having one
copy in both smu_v11_0.c and smu_v12_0.c.

Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/amdgpu_smu.c

@@ -2322,6 +2322,10 @@ int smu_read_sensor(struct smu_context *smu,
 		*(uint32_t *)data = smu->smu_power.power_gate.vcn_gated ? 0 : 1;
 		*size = 4;
 		break;
+	case AMDGPU_PP_SENSOR_MIN_FAN_RPM:
+		*(uint32_t *)data = 0;
+		*size = 4;
+		break;
 	default:
 		if (smu->ppt_funcs->read_sensor)
 			ret = smu->ppt_funcs->read_sensor(smu, sensor, data, size);

drivers/gpu/drm/amd/powerplay/smu_v11_0.c

@@ -1193,10 +1193,6 @@ int smu_v11_0_read_sensor(struct smu_context *smu,
 		ret = smu_v11_0_get_gfx_vdd(smu, (uint32_t *)data);
 		*size = 4;
 		break;
-	case AMDGPU_PP_SENSOR_MIN_FAN_RPM:
-		*(uint32_t *)data = 0;
-		*size = 4;
-		break;
 	default:
 		ret = -EOPNOTSUPP;
 		break;

drivers/gpu/drm/amd/powerplay/smu_v12_0.c

@@ -221,10 +221,6 @@ int smu_v12_0_read_sensor(struct smu_context *smu,
 		ret = smu_get_current_clk_freq(smu, SMU_GFXCLK, (uint32_t *)data);
 		*size = 4;
 		break;
-	case AMDGPU_PP_SENSOR_MIN_FAN_RPM:
-		*(uint32_t *)data = 0;
-		*size = 4;
-		break;
 	default:
 		ret = -EOPNOTSUPP;
 		break;