target/ppc: Fix SPRC/SPRD SPRs for P9/10

target/ppc: Fix SPRC/SPRD SPRs for P9/10

Commit 60d30cff847 ("target/ppc: Move SPR indirect registers into
PnvCore") was mismerged and moved the SPRs to power8-only, instead
of power9/10-only.

Fixes: 60d30cff847 ("target/ppc: Move SPR indirect registers into PnvCore")
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Cc: qemu-stable@nongnu.org
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
(cherry picked from commit b3d47c8303b8be2c3693c5704012b3334741b7ed)
(Mjt: adjust context for v9.2.0-2634-gffb6440cc5 "ppc/pnv: Add new PowerPC Special Purpose Registers (RWMR)")
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>