mlx4_core: Kill mlx4_write64_raw()

It's a leftover from development that's never used in the real driver.

Signed-off-by: Roland Dreier <rolandd@cisco.com>

IB/mlx4: Add a driver Mellanox ConnectX InfiniBand adapters

Add an InfiniBand driver for Mellanox ConnectX adapters. Because
these adapters can also be used as ethernet NICs and Fibre Channel
HBAs, the driver is split into two modules:

mlx4_core: Handles low-level things like device initialization and
processing firmware commands. Also controls resource allocation
so that the InfiniBand, ethernet and FC functions can share a
device without stepping on each other.

mlx4_ib: Handles InfiniBand-specific things; plugs into the
InfiniBand midlayer.

Signed-off-by: Roland Dreier <rolandd@cisco.com>