powerpc/kvm: Add ifdefs around template code

Some of the templates used for KVM patching are only used on certain
platforms, but currently they are always built-in, fix that.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190911115746.12433-4-mpe@ellerman.id.au