ASoc: PCM6240: Create PCM6240 Family driver code

PCM6240 driver implements a flexible and configurable setting for register
and filter coefficients, to one, two or even multiple PCM6240 Family Audio
chips.

Signed-off-by: Shenghao Ding <shenghao-ding@ti.com>
Link: https://lore.kernel.org/r/20240407091846.1299-2-shenghao-ding@ti.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: Shenghao-Ding