With rpmsg sound, when the m4 image is not loaded. There is error log
[ 46.275223] imx-wm8960 sound-rpmsg-wm8960: ASoC: CODEC DAI rpmsg-wm8960-hifi not registered
[ 46.284543] imx-wm8960 sound-rpmsg-wm8960: snd_soc_register_card failed (-517)
The issue is caused by that codec is not registered, the sound
card registration will fail
So add check in probe function for codec dai is ready or not.
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
a52c88bc39