ntb_hw_amd: Style fixes: open code macros that just obfuscate code

As per a comments in [1] by Greg Kroah-Hartman, the ndev_* macros should
be cleaned up. This makes it more clear what's actually going on when
reading the code.

[1] http://www.spinics.net/lists/linux-pci/msg56904.html



Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>