staging.xml: Use meta-linaro from github/kraj and staging brach for meta-angstrom

Change-Id: Id337848ded3574d6cc5c771da4d4ab878d07eeda
Signed-off-by: Khem Raj <raj.khem@gmail.com>
angstrom-next: Add meta-fsl-ppc BSP layer

Change-Id: If879e0a5040ee166d6dd114bacf68f52c2f9352e
Signed-off-by: Khem Raj <raj.khem@gmail.com>