ASoC: rockchip: Add support rt5514 dsp summy dailink

This patch can attach automaticlly rt5514 spi DAI with driver name "rt5514"
in the snd_soc_find_dai process. Turn this feature on, we can enable the
voice wake up via rt5514 dsp for RK3399 Gru Boards.

Signed-off-by: Xing Zheng <zhengxing@rock-chips.com>
Signed-off-by: Mark Brown <broonie@kernel.org>