ASoC: fsl_xcvr: get channel status data in two cases

Merge series from Shengjiu Wang <shengjiu.wang@nxp.com>:

There is two different cases for getting channel status data:
1. With PHY exists, there is firmware running on M core, the firmware
should fill the channel status to RAM space, driver need to read them
from RAM.
2. Without PHY, the channel status need to be obtained from registers.