ARM is moving to stricter checks on readl/write functions,
so we need to use the correct types everywhere.

At the moment, this patch conflicts with other patches in linux-next,
need to sort this out.

Cc: Imre Kaloz <kaloz@openwrt.org>
Cc: Krzysztof Halasa <khc@pm.waw.pl>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>