target-ppc: xer access prototypes no more used & implemented

target-ppc: xer access prototypes no more used & implemented

Revision 5500 of the qemu repository removed all code using
ppc_load_xer & ppc_store_xer as well as their implementation.

Another patch fixes it's usage in kvm-userspace for powerpc, but I think
that header can now be cleaned up, therefore this patch to qemu-devel.

Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5589 c046a42c-6fe2-441c-8c8c-71466251a162