iomux: move IOMUX_GPR13_xxx defines

Move mx6 specific defines to arch-mx6 directory.

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Acked-by: Stefano Babic <sbabic@denx.de>
diff --git a/board/freescale/mx6qsabrelite/mx6qsabrelite.c b/board/freescale/mx6qsabrelite/mx6qsabrelite.c
index 01e5083..a1e3acc 100644
--- a/board/freescale/mx6qsabrelite/mx6qsabrelite.c
+++ b/board/freescale/mx6qsabrelite/mx6qsabrelite.c
@@ -24,6 +24,7 @@
 #include <asm/io.h>
 #include <asm/arch/clock.h>
 #include <asm/arch/imx-regs.h>
+#include <asm/arch/iomux.h>
 #include <asm/arch/mx6x_pins.h>
 #include <asm/errno.h>
 #include <asm/gpio.h>