x86, UV: BAU structure rearranging

Move some structure definitions from the C code to the BAU
header file, and change the organization of that header file a
little.

Signed-off-by: Cliff Wickman <cpw@sgi.com>
Cc: gregkh@suse.de
LKML-Reference: <E1OJvNy-0004aI-54@eag09.americas.sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>