USB: OHCI: nxp: remove useless extern declaration

Remove usb_disabled() extern declaration as it is already declared
as extern in include/linux/usb.h.

Signed-off-by: Manjunath Goudar <csmanjuvijay@gmail.com>
Acked-by: Vladimir Zapolskiy <vz@mleia.com>
Cc: Sylvain Lemieux <slemieux.tyco@gmail.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-usb@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/ohci-nxp.c

@@ -56,8 +56,6 @@ static struct hc_driver __read_mostly ohci_nxp_hc_driver;
 
 static struct i2c_client *isp1301_i2c_client;
 
-extern int usb_disabled(void);
-
 static struct clk *usb_host_clk;
 
 static void isp1301_configure_lpc32xx(void)