modify 3c589_cs to be SMP safe

1. EL3WINDOW is always 1 when lock is not held.

2. The second argument of el3_interrupt is 'void *dev_id',
not 'struct el3_private *lp'.

Adrian Bunk:
backported to 2.6.16

Signed-off-by: Komuro <komurojun-mbn@nifty.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>