i2c: nvidia-gpu: mark resume function as __maybe_unused

When CONFIG_PM is disabled, this is needed to avoid a harmless
unused-function warning:

drivers/i2c/busses/i2c-nvidia-gpu.c:345:12: error: 'gpu_i2c_resume' defined but not used [-Werror=unused-function]

Fixes: c71bcdcb ("i2c: add i2c bus driver for NVIDIA GPU")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

drivers/i2c/busses/i2c-nvidia-gpu.c

@@ -342,7 +342,7 @@ static void gpu_i2c_remove(struct pci_dev *pdev)
 	pci_free_irq_vectors(pdev);
 }
 
-static int gpu_i2c_resume(struct device *dev)
+static __maybe_unused int gpu_i2c_resume(struct device *dev)
 {
 	struct gpu_i2c_dev *i2cd = dev_get_drvdata(dev);