[POWERPC] Remove #ifdef around set_dabr in signal code

set_dabr() and thread.dabr exist on 32 bits as well nowadays (they
actually may do something even, depending on what CPU you have).

So this removes the ifdef.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/kernel/signal.c

@@ -146,15 +146,13 @@ int do_signal(sigset_t *oldset, struct pt_regs *regs)
 		return 0;               /* no signals delivered */
 	}
 
-#ifdef CONFIG_PPC64
         /*
 	 * Reenable the DABR before delivering the signal to
 	 * user space. The DABR will have been cleared if it
 	 * triggered inside the kernel.
 	 */
 	if (current->thread.dabr)
 		set_dabr(current->thread.dabr);
-#endif
 
 	if (is32) {
         	if (ka.sa.sa_flags & SA_SIGINFO)