unicore32: Use generic time config

Signed-off-by: Anna-Maria Gleixner <anna-maria@glx-um.de>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Link: http://lkml.kernel.org/r/20120518163107.383567224@glx-um.de


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