blackfin: Use generic time config

Use seperate selector for clockevents.

Signed-off-by: Anna-Maria Gleixner <anna-maria@glx-um.de>
Cc: Mike Frysinger <vapier@gentoo.org>
Link: http://lkml.kernel.org/r/20120518163105.026597932@glx-um.de


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