linux-wandboard

MLK-16558: ASoC: fsl_hifi4: add reference counter for hifi4 device

When abnormal situation occurs and the current process terminates
abnormally, the hifi4 driver can't get the HIFI4_CODEC_CLOSE CMD
from user space to release the multi-codec resource, so the current
resource can't be used again.

Have found that the fsl_hifi4_close() function can be called
implicitly when process terminates abnormally, so add a reference
counter in fsl_hifi4_open() and fsl_hifi4_close() to check this
abnormal situation, when the number is same for opening and closing
hifi4 device, the multi-codec should be reinitialized again and
the hifi4 driver should send ICM_EXT_MSG_ADDR CMD to hifi4 framework
to initialize the multi-codec resources too.

Signed-off-by: Weiguang Kong <weiguang.kong@nxp.com>