Update clock output names in the Stingray clock DT nodes so they match
the binding document and the latest ASIC datasheet. Also add entries
for LCPLL2

Signed-off-by: Pramod Kumar <pramod.kumar@broadcom.com>
Signed-off-by: Ray Jui <ray.jui@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>