meta-ibm: avsbus-control: 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 avsbus-control script in their image.

Change-Id: Ia5e1d8a42f5b3c5e2e24245a821595dc1aa7309a
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
7 files changed