soc: qcom: llcc: Initialize index before using it

Index to find the phandle from client device node is being used
uninitialized and results into failure parsing the phandle argument.

Change-Id: I70f941afd99ce14153c5e29cf00e2c6fec726634
Signed-off-by: Channagoud Kadabi <ckadabi@codeaurora.org>
Signed-off-by: Runmin Wang <runminw@codeaurora.org>