ppc: Fix migration of the TAR SPR

The TAR special purpose register currently does not get migrated
under KVM because it does not get synchronized with the kernel.
Use spr_register_kvm() instead of spr_register() to fix this issue.
Signed-off-by: NThomas Huth <thuth@redhat.com>
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>

target-ppc/translate_init.c

@@ -7714,10 +7714,10 @@ static void spr_write_tar(DisasContext *ctx, int sprn, int gprn)
 
 static void gen_spr_power8_tce_address_control(CPUPPCState *env)
 {
-    spr_register(env, SPR_TAR, "TAR",
-                 &spr_read_tar, &spr_write_tar,
-                 &spr_read_generic, &spr_write_generic,
-                 0x00000000);
+    spr_register_kvm(env, SPR_TAR, "TAR",
+                     &spr_read_tar, &spr_write_tar,
+                     &spr_read_generic, &spr_write_generic,
+                     KVM_REG_PPC_TAR, 0x00000000);
 }
 
 static void spr_read_tm(DisasContext *ctx, int gprn, int sprn)