[ARM] 4595/1: ns9xxx: define registers as void __iomem * instead of volatile u32

As a consequence registers are now accessed with __raw_{read,write}[bl].

Signed-off-by: Uwe Kleine-König <ukleinek@informatik.uni-freiburg.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>