[reggen] Delete duplicate Register/MultiRegister types in data.py We've recently moved to representing registers, fields etc. in classes, rather than dicts. This duplicated some work done in gen_rtl.py and data.py and this commit removes the duplicated Register and MultiRegister types. There's a certain amount of tidying up in reg_pkg.sv.tpl, which I think makes the implementation a bit easier to read (as much as is possible for template code like this). Signed-off-by: Rupert Swarbrick <rswarbrick@lowrisc.org>
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