meta-ibm: fans: Create machine-specific structure

Yocto automatically adds files/<MACHINE>/ to the file path, take
advantage of this feature to simplify the recipe and directory
structure.

Tested: Built witherspoon, witherspoon-128, and swift, and verified
        they all had the correct fans files in their image.

Change-Id: I22850da7ebbf0c64faa790aaf9a4240d710580ca
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
24 files changed