[C26] set PCIE_REF_CLK_PD to low at boot

Set PCIE_REF_CLK_PD pinmux with pull-down and output LOW. This will
enable the clock generator, before kernel start.

board/seco/imx8qm_c26/imx8qm_c26.c

@@ -164,6 +164,7 @@ int board_early_init_f(void)
 
 #define IMX8_RST_HUB    IMX_GPIO_NR(4, 3)
 #define USB_HC_SEL      IMX_GPIO_NR(4, 6)
+#define PCIE_REF_CLK_PD IMX_GPIO_NR(1, 11)
 
 static void board_gpio_init(void)
 {
@@ -171,11 +172,17 @@ static void board_gpio_init(void)
 	int ret;
 	struct gpio_desc desc;
 	struct power_domain pd;
-    
-    //imx8_iomux_setup_multiple_pads(board_gpios, ARRAY_SIZE(board_gpios));
-    
+
+    sc_pm_set_resource_power_mode( -1, SC_R_GPIO_1, SC_PM_PW_MODE_ON );
     sc_pm_set_resource_power_mode( -1, SC_R_GPIO_4, SC_PM_PW_MODE_ON );
-    
+
+
+    imx8_iomux_setup_multiple_pads(board_gpios, ARRAY_SIZE(board_gpios));
+
+    gpio_request(PCIE_REF_CLK_PD, "PCIE_REF_CLK_PD");
+    gpio_direction_output(PCIE_REF_CLK_PD, 0);
+
+
     ret = dm_gpio_lookup_name("gpio4_3", &desc);
 	if (ret) {
 		printf("%s lookup GPIO@4_3 failed ret = %d\n", __func__, ret);
@@ -202,6 +209,7 @@ static void board_gpio_init(void)
 	dm_gpio_set_dir_flags(&desc, GPIOD_IS_OUT);
 	dm_gpio_set_value(&desc, 0);
 
+
 	if (!power_domain_lookup_name("hsio_sata0", &pd)) {
             ret = power_domain_on(&pd);
             if (ret)

board/seco/imx8qm_c26/imx8qm_c26.h

@@ -37,7 +37,7 @@ static iomux_cfg_t board_pcie_pins[] = {
  * |__________________________________________________________________________|
  */
 static iomux_cfg_t board_gpios[] = {
-	SC_P_USB_SS3_TC0 | MUX_MODE_ALT(3) | MUX_PAD_CTRL(GPIO_PAD_CTRL), // LSIO.GPIO4.IO03: IMX8_RST_HUB
+	SC_P_LVDS1_GPIO01 | MUX_MODE_ALT(3) | MUX_PAD_CTRL(GPIO_PD_PAD_CTRL), // PCIE_REF_CLK_PD
 };
 
 #endif    /*  _BOARD_MX8QM_SECO_C26_H__  */