[PATCH 3/4] ARM: create a common IOMEM definition

* Rob Herring [off-list ref] [120311 14:11]:

From: Rob Herring <redacted>

Several platforms create IOMEM defines for casting to 'void __iomem *',
and other platforms are incorrectly using __io() macro for the same
purpose. This creates a common definition and removes all the platform
specific versions. Rather than try to make linux/io.h and asm/io.h
assembly safe, the assembly version of IOMEM is moved into
asm/assembler.h.

Glad to see this:

Acked-by: Tony Lindgren <tony@atomide.com>