platform: cznic: turris-omnia-mcu: Depend on OF

Add depend on OF, otherwise the compilation fails with
  error: no member named 'of_gpio_n_cells' in 'struct gpio_chip'
  error: no member named 'of_xlate' in 'struct gpio_chip'

Fixes: dfa556e ("platform: cznic: turris-omnia-mcu: Add support for MCU connected GPIOs")
Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
Signed-off-by: Marek Behún <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnd Bergmann <[email protected]>

Author: elkablo

drivers/platform/cznic/Kconfig

@@ -16,6 +16,7 @@ config TURRIS_OMNIA_MCU
 	tristate "Turris Omnia MCU driver"
 	depends on MACH_ARMADA_38X || COMPILE_TEST
 	depends on I2C
+	depends on OF
 	select GPIOLIB
 	select GPIOLIB_IRQCHIP
 	select HW_RANDOM