ppc: Fix stack setup
The exception stack was always set up 64 KiB below the ROM,
ignoring hash table alignment.
Align the stack pointer appropriately.
v2:
* Drop buggy distinction based on PVR value since the previous patch
unifies alignment. Suggested by Segher Boessenkool.
Cc: Alexander Graf <agraf@suse.de>
Cc: Segher Boessenkool <segher@kernel.crashing.org>
Signed-off-by: Andreas Färber <andreas.faerber@web.de>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
git-svn-id: svn://openbios.org/openbios/trunk/openbios-devel@907 f158a5a8-5612-0410-a976-696ce0be7e32