rename CFG_ macros to CONFIG_SYS

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/cpu/sa1100/cpu.c b/cpu/sa1100/cpu.c
index f1bd644..bb4e5a1 100644
--- a/cpu/sa1100/cpu.c
+++ b/cpu/sa1100/cpu.c
@@ -43,7 +43,7 @@
 	 * setup up stacks if necessary
 	 */
 #ifdef CONFIG_USE_IRQ
-	IRQ_STACK_START = _armboot_start - CFG_MALLOC_LEN - CFG_GBL_DATA_SIZE - 4;
+	IRQ_STACK_START = _armboot_start - CONFIG_SYS_MALLOC_LEN - CONFIG_SYS_GBL_DATA_SIZE - 4;
 	FIQ_STACK_START = IRQ_STACK_START - CONFIG_STACKSIZE_IRQ;
 #endif
 	return 0;