mx6sabresd: Include <usb/ehci-ci.h> header file

When compiling with W=1 the following warning is observed:

board/freescale/mx6sabresd/mx6sabresd.c:586:5: warning: no previous prototype for ‘board_ehci_hcd_init’ [-Wmissing-prototypes] int board_ehci_hcd_init(int port)

Remove this warning by including <usb/ehci-ci.h>.

Signed-off-by: Diego Dorta <diego.dorta@nxp.com>

board/freescale/mx6sabresd/mx6sabresd.c

@@ -31,6 +31,7 @@
 #include <power/pfuze100_pmic.h>
 #include "../common/pfuze.h"
 #include <usb.h>
+#include <usb/ehci-ci.h>
 
 DECLARE_GLOBAL_DATA_PTR;