i2c: muxes: pca954x: support PCA9543 I2C switch

The PCA9543 is a 2-channel I2C switch.

Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Reviewed-by: Heiko Schocher <hs@denx.de>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Heiko Schocher<hs@denx.de>
2 files changed