[PATCH 0 of 3] Add memcpy_toio32, a 32-bit MMIO copy routine

Following some discussion with Matt, Andrew and Chris, here is a recast
of the 32-bit MMIO patch I posted the other day.  The routine is now
named memcpy_toio32, and is provided in generic and x86_64-optimised
forms.

I haven't added a memcpy_fromio32, or routines for other access sizes,
because our hardware doesn't need them.  If someone wants them for
reasons of symmetry, I can introduce them.

Signed-off-by: Bryan O'Sullivan <[email protected]>

Follow-Ups:
- [PATCH 3 of 3] Add memcpy_toio32 to each arch
  - From: "Bryan O'Sullivan" <[email protected]>
- [PATCH 2 of 3] memcpy32 for x86_64
  - From: "Bryan O'Sullivan" <[email protected]>
- [PATCH 1 of 3] Introduce __memcpy_toio32
  - From: "Bryan O'Sullivan" <[email protected]>

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