LU-9859 libcfs: delete libcfs/linux/libcfs.h

Lustre uses libcfs.h as a the header to include all headers. This
approach has drawbacks like colliding with MOFED compat headers
that do the same thing. This patch is the first step to unwind
including libcfs.h everywhere. This starts with eliminating
linux/libcfs.h.

Test-Parameters: trivial

Change-Id: Id2040d4295c16135561c8251e160cb2117ee21b8
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: https://review.whamcloud.com/30706


Reviewed-by: Doug Oucharek <dougso@me.com>
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>