PCI: imx6: Remove space before tabs

Remove space before tabs to fix the following checkpatch
warning:

WARNING: please, no space before tabs
+^Icase IMX6QP: ^I^I/* FALLTHROUGH */$
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

drivers/pci/dwc/pci-imx6.c

@@ -338,7 +338,7 @@ static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
 		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
 				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);
 		break;
-	case IMX6QP: 		/* FALLTHROUGH */
+	case IMX6QP:		/* FALLTHROUGH */
 	case IMX6Q:
 		/* power up core phy and enable ref clock */
 		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,