ppc/85xx: Clean up use of LAWAR defines

On 85xx platforms we shouldn't be using any LAWAR_* defines
but using the LAW_* ones provided by fsl-law.h.  Rename any such
uses and limit the LAWAR_ to the 83xx platform as the only user so
we will get compile errors in the future.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/board/freescale/mpc8540ads/law.c b/board/freescale/mpc8540ads/law.c
index f5644e1..4640c1d 100644
--- a/board/freescale/mpc8540ads/law.c
+++ b/board/freescale/mpc8540ads/law.c
@@ -52,7 +52,7 @@
 	/* This is not so much the SDRAM map as it is the whole localbus map. */
 	SET_LAW(CONFIG_SYS_LBC_SDRAM_BASE, LAW_SIZE_256M, LAW_TRGT_IF_LBC),
 	SET_LAW(CONFIG_SYS_PCI1_IO_PHYS, LAW_SIZE_1M, LAW_TRGT_IF_PCI),
-	SET_LAW(CONFIG_SYS_RIO_MEM_PHYS, LAWAR_SIZE_512M, LAW_TRGT_IF_RIO),
+	SET_LAW(CONFIG_SYS_RIO_MEM_PHYS, LAW_SIZE_512M, LAW_TRGT_IF_RIO),
 };
 
 int num_law_entries = ARRAY_SIZE(law_table);