clk: qcom: gcc: Lower OPE clock frequency to 576MHz

There is a RCG frequency overshoot during the switch from gpll8 early
output to main output, which is causing OPE clock to hang. Thus derive
the turbo frequency from GPLL9.

Change-Id: Ia125b5dde04630950697adac4cdbfc7a331cfc28
Signed-off-by: Taniya Das <tdas@codeaurora.org>