ENGR00220567 [MX6 SABRELite] No mxs-perfmon.0 directory

The problem is caused because "mx6_sabrelite_board_init" don't add the
corresponding device node. Problem resolved after add them.
Signed-off-by: Eric Sun <jian.sun@freescale.com>

arch/arm/mach-mx6/board-mx6q_sabrelite.c

@@ -1234,6 +1234,10 @@ static void __init mx6_sabrelite_board_init(void)
 	clk_set_rate(clko2, rate);
 	clk_enable(clko2);
 	imx6q_add_busfreq();
+
+	imx6q_add_perfmon(0);
+	imx6q_add_perfmon(1);
+	imx6q_add_perfmon(2);
 }
 
 extern void __iomem *twd_base;