clk: qcom: clk-krait: unlock spin after mux completion

Unlock spinlock after the mux switch is completed to prevent any corner
case of mux request while the switch still needs to be done.

Fixes: 4d7dc77b ("clk: qcom: Add support for Krait clocks")
Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220430054458.31321-3-ansuelsmth@gmail.com