PPC: 440: Emulate DCBR0

The DCBR0 register on 440 is used to implement system reset. The same
register is used on 405 as well, so just reuse the code.
Signed-off-by: NAlexander Graf <agraf@suse.de>

target-ppc/translate_init.c

@@ -1498,7 +1498,7 @@ static void gen_spr_BookE (CPUPPCState *env, uint64_t ivor_mask)
     /* XXX : not implemented */
     spr_register(env, SPR_BOOKE_DBCR0, "DBCR0",
                  SPR_NOACCESS, SPR_NOACCESS,
-                 &spr_read_generic, &spr_write_generic,
+                 &spr_read_generic, &spr_write_40x_dbcr0,
                  0x00000000);
     /* XXX : not implemented */
     spr_register(env, SPR_BOOKE_DBCR1, "DBCR1",