i2c: muxes: pca954x: add PCA9546 variant

This adds the PCA9546 4-channel i2c bus switch.

Signed-off-by: Chris Packham <judge.packham@gmail.com>
Reviewed-by: Luca Ceresoli <luca@lucaceresoli.net>
Reviewed-by: Heiko Schocher <hs@denx.de>
diff --git a/drivers/i2c/muxes/Kconfig b/drivers/i2c/muxes/Kconfig
index 68f1526..39683fc 100644
--- a/drivers/i2c/muxes/Kconfig
+++ b/drivers/i2c/muxes/Kconfig
@@ -33,8 +33,8 @@
 	  devices. It is x width I2C multiplexer which enables to partitioning
 	  I2C bus and connect multiple devices with the same address to the same
 	  I2C controller where driver handles proper routing to target i2c
-	  device. Supported chips are PCA9543, PCA9544, PCA9547, PCA9548 and
-	  PCA9646.
+	  device. Supported chips are PCA9543, PCA9544, PCA9546, PCA9547,
+	  PCA9548 and PCA9646.
 
 config I2C_MUX_GPIO
         tristate "GPIO-based I2C multiplexer"