[ARM] Kirkwood: only map peripheral register space once

Just like commit 1419468ab548, let's save some TLB entries by making
ioremap() return pointers into the boot-time Kirkwood peripheral
iotable mapping whenever someone tries to ioremap any part of the Kirkwood
peripheral register space.

Signed-off-by: Nicolas Pitre <nico@marvell.com>
1 file changed