clk: msm: clock: Fix uninitialized variable in clock code

In the functions populate_clock_opp_table/populate_opp_table there are
cases where the variables could be used without being initialized, so fix
the same.

CRs-Fixed: 996129
Change-Id: Ic040b9d8d951a04d319b2b762ebde670ffd0e295
Signed-off-by: Taniya Das <tdas@codeaurora.org>