ASoC: aw8896: Keep dev name for aw8896 SmartPA

Keep dev name no change for aw8896 SmartPA.
This is to fix the firmware loading failure.

Change-Id: I5848a7f95e4c0ee63d06d03cd9d96ae0cec4c473
Signed-off-by: Baochu Xu <bxu@codeaurora.org>