Breaking `kernel_src/reveng_rtkit.c`

[reveng007]

Breaking the main kernel c code kernel_src/reveng_rtkit.c into smaller files (or logical blocks).
Based on that, Makefile and README.md must be edited accordingly.

[constantinosgeorgiou]

I can create PR for this issue, please assign it to me.

[constantinosgeorgiou]

I can separate all the functions starting with the prefix etx_ into a separate file.

[reveng007]

Thanks!
You can fork my project and make those changes accordingly and then perform a PR of my project.
I assigned it to you!