greybus: arche-apb-ctrl: Do not export any gpios

With addition of operational state in driver, user/developer
can switch to FW flashing state through sysfs. So no need to
export any gpios to userspace now.

Testing Done: Tested on EVT1.2 and DB3.5 platform
Signed-off-by: Vaibhav Hiremath <vaibhav.hiremath@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/arche-apb-ctrl.c

@@ -58,17 +58,6 @@ static inline void assert_reset(unsigned int gpio)
 	gpio_set_value(gpio, 0);
 }
 
-/* Export gpio's to user space */
-static void export_gpios(struct arche_apb_ctrl_drvdata *apb)
-{
-	gpio_export(apb->resetn_gpio, false);
-}
-
-static void unexport_gpios(struct arche_apb_ctrl_drvdata *apb)
-{
-	gpio_unexport(apb->resetn_gpio);
-}
-
 /*
  * Note: Please do not modify the below sequence, as it is as per the spec
  */
@@ -407,20 +396,15 @@ int arche_apb_ctrl_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	export_gpios(apb);
-
 	dev_info(&pdev->dev, "Device registered successfully\n");
 	return 0;
 }
 
 int arche_apb_ctrl_remove(struct platform_device *pdev)
 {
-	struct arche_apb_ctrl_drvdata *apb = platform_get_drvdata(pdev);
-
 	device_remove_file(&pdev->dev, &dev_attr_state);
 	poweroff_seq(pdev);
 	platform_set_drvdata(pdev, NULL);
-	unexport_gpios(apb);
 
 	return 0;
 }