clk: qcom: clk-cpu-osm: add cluster 2 voter clock for L3

Add another L3 voter clock associated with cluster 2.  This
will allow cluster 2 to meet its performance requirements.

Change-Id: I8e053618ff56d9d02f51a4ff6f367e3bfb83ff36
Signed-off-by: David Collins <collinsd@codeaurora.org>