arm64: imx: imx8mp: Disable PCA954x I2C mux on DH i.MX8MP DRC02 and PicoITX

Neither the DRC02 nor PicoITX carrier board contains the PCA954x I2C mux
chip, the chip is only present on PDK3 carrier board. Disable support for
the PCA954x mux chip and I2C mux altogether on both i.MX8MP DHCOM DRC02 and
PicoITX.

Signed-off-by: Marek Vasut <marex@denx.de>
2 files changed