xen/arm: replace io{read,write}{l,b} with {read,write}{l,b}

We appear to have invented the io versions ourselves for Xen on ARM, while x86
has the plain read/write. (and so does Linux FWIW)

read/write are used in common driver code (specifically ns16550) so instead of
keeping our own variant around lets replace it with the more standard ones.

At the same time resync with Linux making the "based on" comment in both sets of
io.h somewhat true (they don't look to have been very based on before...). Our
io.h is now consistent with Linux v3.11.

Note that iowrite and write take their arguments in the opposite order.

Also make asm-arm/io.h useful and include it where necessary instead of picking
up the include from mm.h. Remove the include from mm.h

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Julien Grall <julien.grall@linaro.org>

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