meta-ibm: drop meta-z

There isn't much content here and there hasn't been any activity in this
layer since it was added over a year ago.  Drop from the tree.

Change-Id: Icac8fe5337f9e0c5e716d57018e87e2c60ec98af
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
6 files changed