Add back the option f to the reboot script (sonic-net#3492)

- What I did
Add back the support to call reboot -f
The support for this option was accidentally removed as part of this PR sonic-net#3203
The same PR for 202311 doesn't have this mistake - sonic-net#3204

- How I did it

- How to verify it
Call reboot -f

scripts/reboot

@@ -178,7 +178,7 @@ function check_conflict_boot_in_fw_update()
 
 function parse_options()
 {
-    while getopts "h?v" opt; do
+    while getopts "h?vf" opt; do
         case ${opt} in
             h|\? )
                 show_help_and_exit