[DellEMC] S6100 - Adding SSD component and platform_fw_au_reboot_handle for auto-update

[santhosh-kt]

Why I did it

• Adding SSD as part of platform components list.
• Introducing platform_fw_au_reboot_handle to use auto-update functionality in fwutil

How I did it

Changes to be committed:
  (use "git restore --staged <file>..." to unstage)
        modified:   platform/broadcom/sonic-platform-modules-dell/debian/platform-modules-s6100.install
        new file:   platform/broadcom/sonic-platform-modules-dell/s6100/scripts/platform_fw_au_reboot_handle
        modified:   platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/chassis.py
        modified:   platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/component.py

How to verify it

• By running fwutil command.

Warning: fwupdate_fwimage_dir: /var/platform/fwpackage/.                                              
Chassis    Module    Component    Firmware                         Version (Current/Available)    Status
---------  --------  -----------  -------------------------------  -----------------------------  ------------------
S6100-ON             BIOS         S6100-BIOS-3.25.0.2-9-noRP2.bin  3.25.0.2-8 / 3.25.0.2-9        update is required
                     FPGA         smf_firmware_upgrade.tar         2.4 / 2.4                      up-to-date
                     CPLD         cpld_firmware_upgrade.tar        4 / 4                          up-to-date
                     SSD          ssd_firmware_upgrade.tar         S16425cG / S16425cG            up-to-date
root@sonic:~#

Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006
• 202012
• 202106

Description for the changelog

A picture of a cute animal (not mandatory but encouraged)