HID: mcp2221: change 'select GPIOLIB' to imply

To avoid recursive dependencies on GPIOLIB when 'imply IIO' is requested
with other drivers we should switch GPIOLIB to an imply.

This isn't the most ideal solution but avoids modifiying the Kconfig for
other drivers, and only requires a singular IS_REACHABLE(CONFIG_GPIOLIB)
check.

Signed-off-by: Matt Ranostay <matt.ranostay@konsulko.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/Kconfig

@@ -1252,7 +1252,7 @@ config HID_ALPS
 config HID_MCP2221
 	tristate "Microchip MCP2221 HID USB-to-I2C/SMbus host support"
 	depends on USB_HID && I2C
-	depends on GPIOLIB
+	imply GPIOLIB
 	help
 	Provides I2C and SMBUS host adapter functionality over USB-HID
 	through MCP2221 device.

drivers/hid/hid-mcp2221.c

@@ -915,9 +915,11 @@ static int mcp2221_probe(struct hid_device *hdev,
 	mcp->gc->can_sleep = 1;
 	mcp->gc->parent = &hdev->dev;
 
+#if IS_REACHABLE(CONFIG_GPIOLIB)
 	ret = devm_gpiochip_add_data(&hdev->dev, mcp->gc, mcp);
 	if (ret)
 		return ret;
+#endif
 
 	return 0;
 }