montblanc:config:update sensor config for SMB_3V3_L_VRM_VOUT and SMB_3V3_R_VRM_VOUT (#764)

Summary:
**Pre-submission checklist**
- [ ] I've ran the linters locally and fixed lint errors related to the files I modified in this PR. You can install the linters by running `pip install -r requirements-dev.txt && pre-commit install`
- [ ] `pre-commit run`
![pre_commit_run](https://github.com/user-attachments/assets/839e3cb9-f97b-4c78-89c7-7d3d0b5584d4)

This PR updates the sensor configurations for SMB_3V3_L_VRM_VOUT and SMB_3V3_R_VRM_VOUT per hardware team requirements.
The update accounts for a hardware change between the main and second source components: the second source requires a multiplication factor of 3 to report correct voltage values.

Pull Request resolved: #764

Test Plan:
Run platform_manager, sensor_service and sensor_service_client to verify the sensor config for SMB_3V3_L_VRM_VOUT and SMB_3V3_R_VRM_VOUT.
main_source:
![sensor_service_client-3 0 20](https://github.com/user-attachments/assets/8cbe04f5-44e0-4550-8d48-e5fdaddbb2a7)
[pm-3.0.20.txt](https://github.com/user-attachments/files/24251341/pm-3.0.20.txt)
[sensors-3.0.20.txt](https://github.com/user-attachments/files/24251344/sensors-3.0.20.txt)
second source:
![sensor_service_client-2 3 10](https://github.com/user-attachments/assets/a3285819-6b16-4ed1-92b5-13ff6bf8ec5c)
[pm-2.3.10.txt](https://github.com/user-attachments/files/24251348/pm-2.3.10.txt)
[sensors-2.3.10.txt](https://github.com/user-attachments/files/24251349/sensors-2.3.10.txt)

Reviewed By: binhuang00

Differential Revision: D89735307

Pulled By: mikechoifb

fbshipit-source-id: f54ac4fd51e6ba9d884e723e87cb50a6a7dce8db

Author: JunjunGu2