clk: qcom: debugcc-qcs405: Update post div mask for measure nodes

Post div mask is not able to correctly set the post div value
which results in wrong measure. Update the same to correctly
measure the clocks.

Change-Id: I5f6560d045919778bdc13e4d72c5f459b0f8210e
Signed-off-by: Shefali Jain <shefjain@codeaurora.org>