[PATCH v2] DRM platform device support

[jcrouse at codeaurora.org]

Here is the second revision implementing platform device
support for DRM.  I've split the original patch into three
and applied most of the comments I got from the previous
go-around.  The first patch removes the resource wrappers from
DRM and switches the drivers to use the bus level functions.
The second patch adds the platform support, and the third patch
adds the ARM specific #ifdefs.

Plus, a bonus patch that ensures that the DRM offset fits into
the pgoff (unsigned long) offset for mmap.  The original code made
a 64 bit value that didn't fly with a 32 bit processor.

Thanks for the comments and keep em coming.

Jordan