[E1031] add platform specific reboot command support (#15889)

* [E1031] add platform specific reboot command support

Why I did it
E1031: add platform specific cold reboot support

How I did it
Use the CPLD to trigger board level power cycle when cold reboot

How to verify it
Do reboot stress test and check the reboot cause history

* [E1031] try to umount filesystem before power cycle reboot

* [E1031] remove fstrim in customized reboot script

Author: qnos

device/celestica/x86_64-cel_e1031-r0/platform_reboot

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+declare -r CPLD_SETREG_PATH="/sys/bus/platform/devices/e1031.smc/setreg"
+
+sync ; sync
+umount -fa > /dev/null 2&>1
+
+# Board level power cycle
+echo "0x0113 0xAA" > ${CPLD_SETREG_PATH}

device/celestica/x86_64-cel_e1031-r0/platform_update_reboot_cause

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+REBOOT_USER=$(logname)
+REBOOT_TIME=$(date)
+declare -r REBOOT_CAUSE_FILE="/host/reboot-cause/reboot-cause.txt"
+
+echo "User issued 'reboot' with platform-specific command [User: ${REBOOT_USER}, Time: ${REBOOT_TIME}]" > ${REBOOT_CAUSE_FILE}
+sync