clk: qcom: msm8916: add 12.288 MHz support to codec dig clk

This patch adds 12.288 MHz suport to codec digital clk, this clock.
Some external PA requires a 12.288 MHz to work.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>