ARM: ux500: bail out on alien cpus

This makes the l2x0 initialization fail gracefully on non-ux500
systems.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm/mach-ux500/cache-l2x0.c

@@ -42,7 +42,8 @@ static int __init ux500_l2x0_init(void)
 	if (cpu_is_u8500_family() || cpu_is_ux540_family())
 		l2x0_base = __io_address(U8500_L2CC_BASE);
 	else
-		ux500_unknown_soc();
+		/* Non-Ux500 platform */
+		return -ENODEV;
 
 	/* Unlock before init */
 	ux500_l2x0_unlock();