There's a closed pull request on the void-packages repository

bootchart2: remove systemd service
https://github.com/void-linux/void-packages/pull/38162

Description:
`bootchartd` only needs to run once at boot. no need to create a service file.

#### Testing the changes
- I tested the changes in this PR: **YES**

#### Local build testing
- I built this PR locally for my native architecture, (x86_64)