[IRDA]: sti/cli removal from EP7211 IrDA driver

This patch replaces the deprecated sti/cli routines with the corresponding
spin_lock ones.

Signed-off-by: David chosrova <david.chosrova@libertysurf.fr>
Signed-off-by: Samuel Ortiz <samuel.ortiz@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>