clocksource: tegra20: use the device_node pointer passed to init
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: NRob Herring <rob.herring@calxeda.com> Cc: John Stultz <johnstul@us.ibm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: NStephen Warren <swarren@nvidia.com> Tested-by: NStephen Warren <swarren@nvidia.com>
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