base-defconfig: add PINCTRL for MTL

[keqiaozhang]

Need to enable PINCTL for MTL to solve the codec driver probe issue on Rex

[mengdonglin]

@plbossart Could you share more info why only I2S codec RT5682S depends on pinctrl/GPIO support for MTL?

https://github.com/thesofproject/linux/blob/topic/sof-dev/drivers/pinctrl/intel/pinctrl-meteorlake.c defined not only GPIO pins used as I2C (SCL and SDA) to connect RT5682S, but also those SDW and HDA pins. And I think these pin mux are configured by UEFI BIOS or coreboot. HDAudio and SDW codecs works fine without CONFIG_PINCTRL_METEORLAKE. It seems kernel only needs pinctrl/GPIO for I2C.

[plbossart]

@mengdonglin I think you answered to your own question: the probe failures are entirely related to I2C access. I2S is only used for data and not for probe. If there was a pin-mux issue on the I2S pins, you would see it only when trying to enable a transfer (e.g. clock stuck on low or high, data not enabled, etc).