ColdFire: Change invalid JMP to BRA caught by new v4e toolchain

Signed-off-by: Kurt Mahan <kmahan@freescale.com>

cpu/mcf5445x/start.S

@@ -253,7 +253,7 @@ clear_bss:
 /* exception code */
 	.globl _fault
 _fault:
-	jmp _fault
+	bra _fault
 	.globl	_exc_handler
 
 _exc_handler:

cpu/mcf547x_8x/start.S

@@ -259,7 +259,7 @@ clear_bss:
 /* exception code */
 	.globl _fault
 _fault:
-	jmp _fault
+	bra _fault
 	.globl	_exc_handler
 
 _exc_handler: