Re-add finer grained compilation control that was lost in the CMSIS
split (#56957). CMSIS DSP is several hundred files and has a measurable
effect on compile times.
Only compiling features that are required improves this.
Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>
The names have underscores within them. Somehow it was still being found
within the build but not with building documents. This renames them to
the correct name.
Signed-off-by: Ryan McClelland <ryanmcclelland@meta.com>