staging: android: ion: Replace seq_printf with seq_puts

It is preferred to use seq_puts instead of seq_printf here, as it suffices string printing.

Signed-off-by: Iulia Manda <iulia.manda21@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>