KVM: PPC: Book3S PR: Enable in-kernel TCE handlers for PR KVM

The handlers support PR KVM from the day one; however the PR KVM's
enable/disable hcalls handler missed these ones.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>