clk: qcom: Fix MSM8916 gfx3d_clk_src configuration

The gfx3d_clk_src parents configuration is incorrect. Fix it.

Fixes: 3966fab8 "clk: qcom: Add MSM8916 Global Clock Controller support"
Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>