omap: Fix IO_ADDRESS() macros

omap: Fix IO_ADDRESS() macros

Modified version of Russell's patch 40c0133a904466ec5423d1088d3c85598ac9e030
to apply to linux-omap tree.

OMAP1_IO_ADDRESS(), OMAP2_IO_ADDRESS() and IO_ADDRESS() returns cookies
for use with __raw_{read|write}* for accessing registers.  Therefore,
these macros should return (void __iomem *) cookies, not integer values.

Doing this improves typechecking, and means we can find those places
where, eg, DMA controllers are incorrectly given virtual addresses to
DMA to, or physical addresses are thrown through a virtual to physical
address translation.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>