MLK-13331 mx6sll_arm2: Output WDOG_B signal to reset PMIC

Since the LPDDR2/3 does not have reset pin, to keep safe reset, we need
to use WDOG_B to reset PMIC. Add pinmux and relevant settings.

Signed-off-by: Ye Li <ye.li@nxp.com>

board/freescale/mx6sll_arm2/mx6sll_arm2.c

@@ -105,6 +105,10 @@ int dram_init(void)
 	return 0;
 }
 
+static iomux_v3_cfg_t const wdog_pads[] = {
+	MX6_PAD_WDOG_B__WDOG1_B | MUX_PAD_CTRL(NO_PAD_CTRL),
+};
+
 static iomux_v3_cfg_t const led_pads[] = {
 	MX6_PAD_EPDC_VCOM1__GPIO2_IO04 | MUX_PAD_CTRL(UART_PAD_CTRL),
 };
@@ -503,6 +507,10 @@ int board_late_init(void)
 	board_late_mmc_env_init();
 #endif
 
+	imx_iomux_v3_setup_multiple_pads(wdog_pads, ARRAY_SIZE(wdog_pads));
+
+	set_wdog_reset((struct wdog_regs *)WDOG1_BASE_ADDR);
+
 	return 0;
 }