x86: drop unneeded __packed attributes

x86: drop unneeded __packed attributes

There where a couple of unneeded packed attributes in several x86-specific
structures, that are obviously aligned. The only non-trivial one is
vmcb_struct, which has been checked to have the same layout with and without
the packed attribute using pahole. In that case add a build-time size check to
be on the safe side.

No functional change is expected as a result of this commit.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
master commit: 4036e7c592905c2292cdeba8269e969959427237
master date: 2017-03-07 17:11:06 +0100