[PATCH] ppc64: Add IDE-pmac support for new "Shasta" chipset

The iMac G5 and new single CPU PowerMac G5 come with a new revision of the
K2 ASIC called Shasta.  The PATA cell in there now does 133Mhz.  This patch
adds support for it.  It also adds some power management bits to the old
100MHz cell that was in Intrepid based ppc32 machines.  The original iMac
G5 bits are from J.  Mayer <l_indien@magic.fr>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>