powerpc: Remove DEBUG define in 64-bit early setup code

This statement causes some not very useful messages to always
be printed on the serial port at boot, even on quiet boots.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/kernel/setup_64.c

@@ -10,8 +10,6 @@
  *      2 of the License, or (at your option) any later version.
  */
 
-#define DEBUG
-
 #include <linux/export.h>
 #include <linux/string.h>
 #include <linux/sched.h>