[202411] Revert "Mount the /tmp directory as tmpfs" (#22080)

[202411] Revert "Mount the /tmp directory as tmpfs"

Author: lizhijianrd

files/initramfs-tools/union-mount.j2

@@ -218,9 +218,6 @@ mkdir -p ${rootmnt}/boot
 mkdir -p ${rootmnt}/host/$image_dir/boot
 mount --bind ${rootmnt}/host/$image_dir/boot ${rootmnt}/boot
 
-## Mount the /tmp directory as tmpfs
-mount -t tmpfs -o rw,nosuid,nodev,size=25% tmpfs ${rootmnt}/tmp
-
 ## Mount loop device or tmpfs for /var/log
 if $logs_inram; then
     # NOTE: some platforms, when reaching initramfs stage, have a small