86xx: Move the clear_tlbs before MMU turn on

We must invalidate TLBs before MMU turn on, but
currently the code is not, if there are some stale
TLB entry valid in the TLBs, it will cause strange
issue.
Signed-off-by: NDave Liu <daveliu@freescale.com>
Acked-by: NBecky Bruce <becky.bruce@freescale.com>

cpu/mpc86xx/start.S

@@ -202,8 +202,12 @@ boot_warm:
 	mtmsr	0
 #endif
 
+	/* Invalidate BATs */
 	bl	invalidate_bats
 	sync
+	/* Invalidate all of TLB before MMU turn on */
+	bl      clear_tlbs
+	sync
 
 #ifdef CONFIG_SYS_L2
 	/* init the L2 cache */
@@ -275,7 +279,6 @@ in_flash:
 
 	/* setup the rest of the bats */
 	bl      setup_bats
-	bl      clear_tlbs
 	sync
 
 #if (CONFIG_SYS_CCSRBAR_DEFAULT != CONFIG_SYS_CCSRBAR)