i.MX6 (DQ/DLS): use macros for mux and pad declarations

This allows the use of either or both declarations from
the files mx6q_pins.h and mx6dl_pins.h.

All board files should include <asm/arch/mx6-pins.h>
with one of the following defined in boards.cfg
    MX6Q   - for boards targeting i.MX6Q or i.MX6D
    MX6DL  - for boards targeting i.MX6DL
    MX6S   - for boards targeting i.MX6S
    MX6QDL - for boards that support any of the above with
             run-time detection

Pad declarations will be MX6_PAD_x for single-variant boards
and MX6Q_PAD_x and MX6DL_PAD_x for boards supporting both
processor classes.

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
Acked-by: Stefano Babic <sbabic@denx.de>
diff --git a/board/freescale/mx6qarm2/mx6qarm2.c b/board/freescale/mx6qarm2/mx6qarm2.c
index 1b4791c..e063407 100644
--- a/board/freescale/mx6qarm2/mx6qarm2.c
+++ b/board/freescale/mx6qarm2/mx6qarm2.c
@@ -7,7 +7,7 @@
 #include <common.h>
 #include <asm/io.h>
 #include <asm/arch/imx-regs.h>
-#include <asm/arch/mx6q_pins.h>
+#include <asm/arch/mx6-pins.h>
 #include <asm/arch/clock.h>
 #include <asm/errno.h>
 #include <asm/gpio.h>