selftests/powerpc: Make reg.h common to all powerpc selftests

Currently there is a reg.h in pmu/ebb that has defines that are useful
in other powerpc selftests so move this up into selftests/powerpc
folder. Also include in utils.h - as this is often used in self tests.
Add in some other useful register defines.

Signed-off-by: Rashmica Gupta <rashmicy@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

tools/testing/selftests/powerpc/utils.h

@@ -11,6 +11,7 @@
 #include <stdint.h>
 #include <stdbool.h>
 #include <linux/auxvec.h>
+#include "reg.h"
 
 /* Avoid headaches with PRI?64 - just use %ll? always */
 typedef unsigned long long u64;