[ARM] pxa/spitz: provide spitz_ohci_exit() that unregisters USB_HOST GPIO

Currently spitz_ohci_init() that requests GPIO doesn't have
corresponding spitz_ohci_exit() which will gpio_free(). This causes
minor problems e.g. during resume when the OHCI device can't be resumed.
Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: Eric Miao <eric.miao@marvell.com>

arch/arm/mach-pxa/spitz.c

@@ -531,9 +531,15 @@ static int spitz_ohci_init(struct device *dev)
 	return gpio_direction_output(SPITZ_GPIO_USB_HOST, 1);
 }
 
+static void spitz_ohci_exit(struct device *dev)
+{
+	gpio_free(SPITZ_GPIO_USB_HOST);
+}
+
 static struct pxaohci_platform_data spitz_ohci_platform_data = {
 	.port_mode	= PMM_NPS_MODE,
 	.init		= spitz_ohci_init,
+	.exit		= spitz_ohci_exit,
 	.flags		= ENABLE_PORT_ALL | NO_OC_PROTECTION,
 	.power_budget	= 150,
 };