HWP Encoder: CPU level UDP packet counter

[ykyohei]

Add CPU level UDP packet counter to the HWP encoder

Description

To identify either we drop the hwp encoer packet at PRU->CPU level or at the network level (UDP packet loss), we add the CPU level packet counter. The counter_index is indexed in PRU level.

This agent assumes updated sobonelib https://github.com/simonsobs/sobonelib/pull/4 .

How Has This Been Tested?

This is not tested yet,

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• [ ] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.