dump_types: change filenames to [ch]pp.mako

We have a tendency to name mako files as "foo.type.mako" rather than
"foo.mako.type" because too many tools tend to identify the file as a
"type file" rather than a "mako file".  Right now, meson is somehow
picking up these files as part of the `clang-tidy` invocation and
puking on it.  Rename the files both to fit convention and to avoid
the issues.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I65a80860242f7d8841b5d3a18d9847d87d087eb8