[C31] [DEFCONFIG] Enable GPIO_WATCHDOG support for TPS3851

SBC-C31 has TPS3851 voltage supervisor with integrated watchdog.
GPIO_WATCHDOG is sufficient to have basic watchdog functionality and
manage its pin (WDI), once watchdog is enabled in U-boot using pin (SET1).
Enable GPIO_WATCHDOG_ARCH_INITCALL to raise initcall level to arch_initcall

arch/arm64/configs/seco_linux_defconfig

@@ -271,6 +271,8 @@ CONFIG_DEVFREQ_THERMAL=y
 CONFIG_ROCKCHIP_THERMAL=y
 CONFIG_WATCHDOG=y
 CONFIG_DW_WATCHDOG=y
+CONFIG_GPIO_WATCHDOG=y
+CONFIG_GPIO_WATCHDOG_ARCH_INITCALL=y
 CONFIG_MFD_RK806_SPI=y
 CONFIG_MFD_RK808=y
 CONFIG_MFD_TPS6586X=y