Code cleanup to meet coding conventions

[phillipstanleymarbell]

Code cleanup to meet coding conventions.

[harrysarson]

Are there verilog code conventions?

[phillipstanleymarbell]

https://github.com/physical-computation/Sail-RV32I-common/blob/master/README-RTLCodingConvention.md

[phillipstanleymarbell]

BTW, don't worry, this issue is for me to do, leading up to using this in GB3, not for @harrysarson or for @rjlv2.