omap: fix sleep after recent oc patch

This reverts partially commit 2c8cac5e064689545b015c6ad7df38bfc43c5dcf.

There was a bug with the dsp frequency which caused
a SOD when the device tried to sleep.

Signed-off-by: Blechd0se <alex.christ@hotmail.de>

Conflicts:
	arch/arm/mach-omap2/opp3xxx_data.c