Added explicit names to generated blocks

Created by: Silabs-ArjanB

Hi @strichmo Can you please have a look and let me know if you agree with the naming style. I tried to give all generated blocks a gen_ prefixed name.

The code is sequentially equivalent to the original code (had to rewrite some code in register file and CSR file to get proper block naming).

Reason for the gen_ prefixing is to have constant names that can be used in waivers, code coverage, etc.

Signed-off-by: Arjan Bink Arjan.Bink@silabs.com