Add missing definition for number of input pins for the PowerPC 970 bus.
Use proper INPUT_NB definitions to allocate PowerPC input pins structure,
  fixing a buffer overflow in the 6xx bus case.


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3659 c046a42c-6fe2-441c-8c8c-71466251a162
