clockgating-plugin: not compiled; name mismatch

[hzeller]

there is a toplevel directory called clockgating-plugin, but inside is a Makefile that builds a plugin called reg_clock_gating.

This is never built, as it is not mentioned in the plugin list. And if so, it would not work as the plugin name is different than the directory implies.

So either the directory has to be renamed or the plugin itself. Also, needs to be added to PLUGIN_LIST.

[hzeller]

Assigning to Karol to triage.