geni-qcom-se: Correct the BW update logic

ICB clock scalling function doesn't honour the new ab/ib vote if
we pass same index for consecutive calls of the function.
Call the ICB clock scalling function everytime with a different
array index in order for ICB driver to honour new ab/ib values.

Change-Id: Iac664d042b82df380dd98173f75a1c1319ccf1d1
Signed-off-by: Prudhvi Yarlagadda <pyarlaga@codeaurora.org>