Modify for ppc capability support

on ppc
#/usr/libexec/qemu-kvm --cpu ?|grep -i ppc
PowerPC ppc32            (alias for 604)
PowerPC ppc              (alias for 604)
PowerPC ppc64            (alias for 970fx_v3.1)

on x86_64
#/usr/libexec/qemu-kvm --cpu ?|grep qemu
x86           qemu64  QEMU Virtual CPU version 2.1.2         
x86           qemu32  QEMU Virtual CPU version 2.1.2