arm64: dts: freescale: imx8mm-var-som: Add support for WM8904 audio codec

arm64: dts: freescale: imx8mm-var-som: Add support for WM8904 audio codec

The VAR-SOM-MX8MM can integrate the WM8904, a high-performance
ultra-low-power stereo codec optimized for portable audio applications.

Add the WM8904 device to the appropriate I2C bus, enable the SAI
peripheral, and introduce the sound node to expose the sound card to the
system.

Add I3C recovery gpio properties.

Signed-off-by: Stefano Radaelli <stefano.r@variscite.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>