The AM3517 has a different OTG controller location than the OMAP3,
which is included from omap3.dtsi.  This results in a hwmod error.
Since the AM3517 has a different OTG controller address, this patch
disabes one that is isn't available.
Signed-off-by: NAdam Ford <aford173@gmail.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>