powerpc: Fix setting of oprofile cpu type

commit 2657dd4e introduced a
bug where we would now always override the "real" oprofile CPU
type with the "compatible" one provided by a pseudo-PVR in the
device-tree which is incorrect and breaks oprofile on all current
configs since the "compatible" ones aren't yet recognized.

This fixes it.
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/kernel/cputable.c

@@ -1837,8 +1837,8 @@ static void __init setup_cpu_spec(unsigned long offset, struct cpu_spec *s)
 		 * oprofile_cpu_type.
 		 */
 		if (old.oprofile_cpu_type == NULL) {
-			t->oprofile_cpu_type = s->oprofile_cpu_type;
-			t->oprofile_type = s->oprofile_type;
+			t->oprofile_cpu_type = old.oprofile_cpu_type;
+			t->oprofile_type = old.oprofile_type;
 		}
 	}