qcom: clock-cpu-8994: Set cached mux sel when setting up A57 clocks

The A57 clocks are setup before probe can happen - in
an early_initcall. Set the cached mux selection in the
A57 mux structures to match the selection being programmed.

Change-Id: I488b38819a038820b1800ea434a08431daa85965
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>