another pmem variant

[Christoph Hellwig <hch@lst.de>]

Here is another version of the same trivial pmem driver, because two
obviously aren't enough.  The first patch is the same pmem driver
that Ross posted a short time ago, just modified to use platform_devices
to find the persistant memory region instead of hardconding it in the
Kconfig.  This allows to keep pmem.c separate from any discovery mechanism,
but still allow auto-discovery.

The other two patches are a heavily rewritten version of the code that
Intel gave to various storage vendors to discover the type 12 (and earlier
type 6) nvdimms, which I massaged into a form that is hopefully suitable
for mainline.

Note that pmem.c really is the minimal version as I think we need something
included ASAP.  We'll eventually need to be able to do other I/O from and
to it, and as most people know everyone has their own preferre method to
do it, which I'd like to discuss once we have the basic driver in.

This has been tested both with a real NVDIMM on a system with a type 12
capable bios, as well as with "fake persistent" memory using the memmap=
option.