SIM is mounting /tmp as vfat instead of using TMPFS

[acassis]

After TMPFS was added into NuttX many years ago, the /tmp start to use it, but for some reason we forgot to update it:

$ ./nuttx 
login: admin
password: 
User Logged-in!
nsh> mount
  /bin type binfs
  /etc type romfs
  /proc type procfs
  /tmp type vfat
nsh> 

Before to fix it I want to confirm it is fine for everybody.

[xiaoxiang781216]

yes, let's fix it, @acassis .