gpio: pca935x: Allow IRQ support for driver built as a module

Perhaps by some historical reasons the IRQ support has been allowed
only for built-in driver. However, there is nothing prevents us
to build it as module an use as IRQ chip.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

drivers/gpio/Kconfig

@@ -952,7 +952,7 @@ config GPIO_PCA953X
 
 config GPIO_PCA953X_IRQ
 	bool "Interrupt controller support for PCA953x"
-	depends on GPIO_PCA953X=y
+	depends on GPIO_PCA953X
 	select GPIOLIB_IRQCHIP
 	help
 	  Say yes here to enable the pca953x to be used as an interrupt