power, timer: reset TBL before TBU

In order to avoid TBU increment due to TBL reaching its max
and wrapping, reset TBL before resetting TBU

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
diff --git a/arch/powerpc/lib/time.c b/arch/powerpc/lib/time.c
index ff9bb67..c43f254 100644
--- a/arch/powerpc/lib/time.c
+++ b/arch/powerpc/lib/time.c
@@ -66,7 +66,7 @@
 	unsigned long temp;
 
 	/* reset */
-	asm volatile("li %0,0 ; mttbu %0 ; mttbl %0;"
+	asm volatile("li %0,0 ; mttbl %0 ; mttbu %0;"
 	     : "=&r"(temp) );
 
 	return (0);