soundwire: intel_ace2.x: Use str_read_write() helper

Remove hard-coded strings by using the str_read_write() helper.

Signed-off-by: Yumeng Fang <fang.yumeng@zte.com.cn>
Signed-off-by: Yunjian Long <long.yunjian@zte.com.cn>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20250523141910793yUFpjomfu0byK_yFddHQu@zte.com.cn


Signed-off-by: Vinod Koul <vkoul@kernel.org>