clk: qcom: clk-cpu-osm: Update logic to populate the rate table

The logic to populate the rate table for a cluster is currently
flawed and never adds the highest supported single core frequency.
Correct this.

Change-Id: I89b73c9589ad916fa5af9edad420baa4c5a40111
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>