More tidying up.

The htab_data structure contained 5 fields or which two were completely
unused and one other was just kept for printing at boot time.  I have mode
the remaining two into global variables.

Built and booted on iSeries (which is always lpar) and on pSeries without
partitioning.
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>