PCI: imx6: Use gpio_set_value_cansleep()

We are in a context where we can sleep, and the PCIe reset gpio may be on
an I2C expander.  Use the cansleep() variant when setting the GPIO value.

Based on a patch from Russell King for pci-mvebu.c.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>

drivers/pci/host/pci-imx6.c

@@ -288,9 +288,9 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
 
 	/* Some boards don't have PCIe reset GPIO. */
 	if (gpio_is_valid(imx6_pcie->reset_gpio)) {
-		gpio_set_value(imx6_pcie->reset_gpio, 0);
+		gpio_set_value_cansleep(imx6_pcie->reset_gpio, 0);
 		msleep(100);
-		gpio_set_value(imx6_pcie->reset_gpio, 1);
+		gpio_set_value_cansleep(imx6_pcie->reset_gpio, 1);
 	}
 	return 0;