IB/hfi1: Rework file list in Makefile

We want to keep files in alphabetical order in our makefile, however this
just makes for messy diffs when adding (or removing) files. Let's just clean
this up and make it line by line.

Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>