KVM: PPC: Book3S HV: Remove TM emulation from POWER7/8 path

TM fake-suspend emulation is only used by POWER9. Remove it from the old
code path.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210811160134.904987-3-npiggin@gmail.com