platform-drivers-x86 for v4.16-3

Mellanox fixes and new system type support.

The following is an automated git shortlog grouped by driver:

mlx-platform:
 -  Add support for new 200G IB and Ethernet systems
 -  Add support for new msn201x system type
 -  Add support for new msn274x system type
 -  Fix power cable setting for msn21xx family
 -  Add define for the negative bus
 -  Use defines for bus assignment

platform/mellanox:
 -  mlxreg-hotplug: Fix uninitialized variable
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