openrisc: Use generic time config

Signed-off-by: Anna-Maria Gleixner <anna-maria@glx-um.de>
Acked-by: Jonas Bonn <jonas@southpole.se>
Link: http://lkml.kernel.org/r/20120518163106.333611712@glx-um.de


Signed-off-by: Thomas Gleixner <tglx@linutronix.de>