clk: qcom: clk-cpu-osm: Rework the MEM_ACC_LEVEL setting logic

The MEM_ACC_LEVEL settings that the OSM driver is currently
programming are off from those listed in the voltage plan.
Correct this.

Change-Id: I26c9907c4deb96dd84f57c84a3737b11996ccd04
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>