KVM: PPC: Book3S HV: Remove radix guest support from P7/8 path

The P9 path now runs all supported radix guest combinations, so
remove radix guest support from the P7/8 path.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210528090752.3542186-24-npiggin@gmail.com