ppc: move POWER8 Book4 regs in their own routine

commit fce55481360d "ppc: A couple more dummy POWER8 Book4 regs"
squashed in to rapidly a set of POWER8 Book4 regs in the wrong
routine. This patch introduces the missing gen_spr_power8_book4()
routine to fix their location.
Signed-off-by: NCédric Le Goater <clg@fr.ibm.com>
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>

target-ppc/translate_init.c

@@ -8018,6 +8018,13 @@ static void gen_spr_power8_ic(CPUPPCState *env)
                     &spr_read_generic, SPR_NOACCESS,
                     &spr_read_generic, &spr_write_generic,
                     0);
+#endif
+}
+
+static void gen_spr_power8_book4(CPUPPCState *env)
+{
+    /* Add a number of P8 book4 registers */
+#if !defined(CONFIG_USER_ONLY)
     spr_register_kvm(env, SPR_ACOP, "ACOP",
                      SPR_NOACCESS, SPR_NOACCESS,
                      &spr_read_generic, &spr_write_generic,
@@ -8086,6 +8093,7 @@ static void init_proc_book3s_64(CPUPPCState *env, int version)
         gen_spr_power8_pspb(env);
         gen_spr_vtb(env);
         gen_spr_power8_ic(env);
+        gen_spr_power8_book4(env);
     }
     if (version < BOOK3S_CPU_POWER8) {
         gen_spr_book3s_dbg(env);