*_s4.c
Add new sources for 4 bit function variants to build system. Signed-off-by: Jordan Yates <jordan@embeint.com>
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>