m68k: Fix wrong assembler instruction in start.S

The jmp _fault generated the following error message, thus change it
to bra _fault:

start.S: Assembler messages:
start.S:310: Error: Conversion of PC relative displacement to absolute

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: "Jin Zhengxiong-R64188" <R64188@freescale.com>
Cc: Jason Jin <jason.jin@freescale.com>
diff --git a/arch/m68k/cpu/mcf532x/start.S b/arch/m68k/cpu/mcf532x/start.S
index fe98d76..583ed1d 100644
--- a/arch/m68k/cpu/mcf532x/start.S
+++ b/arch/m68k/cpu/mcf532x/start.S
@@ -261,7 +261,7 @@
 /* exception code */
 	.globl _fault
 _fault:
-	jmp _fault
+	bra _fault
 	.globl	_exc_handler
 
 _exc_handler: