usb: ohci-sa1111: use sa1111_get_irq() to obtain IRQ resources

Use the provided sa1111_get_irq() to fetch the IRQ resources for the
SA1111 OHCI driver.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>