after studying about BCM4343 and the Avnet SIP i found out that the i2s pins are located at pin 30-33 on the SIP-Module and on D4-D7 on the IoT Starter Kit.
But I have not found any details about accessing the i2s interface in WICED platform files. In some other platform directorys from different evaluation boards is the i2s interface mentioned. So is there a way to access the i2s interface through pcm/pdm in WICED? Maybe I have to edit the platform files?