ENGR00180493 SabreSD: register perfmon driver

Fix perfmon:no mxs-perfmon.0 directory after inserting mxs-perfmon.ko.
Signed-off-by: Frank Li <Frank.Li@freescale.com>

arch/arm/mach-mx6/board-mx6q_sabresd.c

@@ -1853,6 +1853,9 @@ static void __init mx6_sabresd_board_init(void)
 	}
 
 	imx6_add_armpmu();
+	imx6q_add_perfmon(0);
+	imx6q_add_perfmon(1);
+	imx6q_add_perfmon(2);
 }
 
 extern void __iomem *twd_base;