ibm: remove useless ibm.inc configuration file

ibm.inc simply includes openpower.inc.  That, and meta-ibm is a distro
policy layer and doesn't enable any specific hardware.

Update machine configurations to include openpower.inc directly.  Add a
conf/distro/include/ibm.inc to meta-ibm at a later time when meta-ibm
has distro policy to apply.

Change-Id: I0d66d8dae719bf3958f195f15181a487716ee1e0
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
5 files changed