rename CFG_ macros to CONFIG_SYS

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/cpu/arm926ejs/cpu.c b/cpu/arm926ejs/cpu.c
index 56c6289..48a2c0b 100644
--- a/cpu/arm926ejs/cpu.c
+++ b/cpu/arm926ejs/cpu.c
@@ -95,7 +95,7 @@
 	 * 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;