Kconfig: i2c: Fix indentation

Use tabs instead of space for indentation.

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

drivers/i2c/muxes/Kconfig

@@ -8,10 +8,10 @@ config I2C_MUX
 	  using a suitable I2C MUX driver.
 
 config I2C_ARB_GPIO_CHALLENGE
-        bool "GPIO-based I2C arbitration"
-        depends on I2C_MUX
-        help
-          If you say yes to this option, support will be included for an
-          I2C multimaster arbitration scheme using GPIOs and a challenge &
-          response mechanism where masters have to claim the bus by asserting
-          a GPIO.
+	bool "GPIO-based I2C arbitration"
+	depends on I2C_MUX
+	help
+	  If you say yes to this option, support will be included for an
+	  I2C multimaster arbitration scheme using GPIOs and a challenge &
+	  response mechanism where masters have to claim the bus by asserting
+	  a GPIO.