[SmartSwitch] Extend reboot script for rebooting SmartSwitch

[vvolam]

What I did

Extended reboot script for SmartSwitch cases to reboot entire SmartSwitch or a specific DPU

How I did it

Implemented changes according to https://github.com/sonic-net/SONiC/blob/605c3a56ac2717dbbb638433e7bb13054fc05a31/doc/smart-switch/reboot/reboot-hld.md

How to verify it

--Pending testing on SmartSwitch--

• Verified the script on non-smart switch and didn't find any regressions. Also script throughs errors if any new smart switch related parameters are given by user.

Previous command output (if the output of a command-line utility has changed)

New command output (if the output of a command-line utility has changed)