powerpc/qe: add new qe properties for QE based chips

Add fsl,qe-num-riscs and fsl,qe-num-snums to all the devices trees which
have qe node.

Signed-off-by: Haiying Wang <Haiying.Wang@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>