dsp: afe: add new clk state and lock for codec clk cmds

There's some race condition when sending afe cmds between
USB playback and codec clk enablement. Add new clk_state,
clk_status and clk lock to resolve the race condition.

Change-Id: I2ccc77c20a274b797129b8b674c026ef003353d4
Signed-off-by: Meng Wang <mengw@codeaurora.org>