gpio: bt8xx: fix release of managed resources

These resources are managed by devres, and should not be explicitly
released.

Signed-off-by: Michael Auchter <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

drivers/gpio/gpio-bt8xx.c

···
 	bgwrite(~0x0, BT848_INT_STAT);
 	bgwrite(0x0, BT848_GPIO_OUT_EN);
 
-	iounmap(bg->mmio);
-	release_mem_region(pci_resource_start(pdev, 0),
-			   pci_resource_len(pdev, 0));
 	pci_disable_device(pdev);
 }