update ppc atomic code to match the endian-agnostic version on other archs

arch/powerpc/atomic.h

@@ -101,24 +101,16 @@ static inline void a_or(volatile int *p, int v)
 
 static inline void a_and_64(volatile uint64_t *p, uint64_t v)
 {
-#if __BYTE_ORDER == __LITTLE_ENDIAN
-	a_and((int *)p, v);
-	a_and((int *)p+1, v>>32);
-#else
-	a_and((int *)p+1, v);
-	a_and((int *)p, v>>32);
-#endif
+	union { uint64_t v; uint32_t r[2]; } u = { v };
+	a_and((int *)p, u.r[0]);
+	a_and((int *)p+1, u.r[1]);
 }
 
 static inline void a_or_64(volatile uint64_t *p, uint64_t v)
 {
-#if __BYTE_ORDER == __LITTLE_ENDIAN
-	a_or((int *)p, v);
-	a_or((int *)p+1, v>>32);
-#else
-	a_or((int *)p+1, v);
-	a_or((int *)p, v>>32);
-#endif
+	union { uint64_t v; uint32_t r[2]; } u = { v };
+	a_or((int *)p, u.r[0]);
+	a_or((int *)p+1, u.r[1]);
 }
 
 #endif