We've already matched the node, so use the node pointer passed in. The rtc
init was intermingled with the timer init, so split this out to a separate
init function.
Signed-off-by: Rob Herring <rob.herring@calxeda.com>

Cc: John Stultz <johnstul@us.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Stephen Warren <swarren@nvidia.com>