powerpc/85xx: handle both "secX.Y" and "sec-vX.Y" properties

versioned SEC properties changed names during development, so
for now search and update LIODNs for both "secX.Y" and
"sec-vX.Y" based properties.

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>