Kconfig: i2c: Fix typo Suport -> Support

Fix typo in command description.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

drivers/i2c/muxes/Kconfig

 config I2C_MUX
-	bool "Suport I2C multiplexers"
+	bool "Support I2C multiplexers"
 	depends on DM_I2C
 	help
 	  This enables I2C buses to be multiplexed, so that you can select