ARM: fix LTO for rockchip and samsung

When building with LTO, the compiler complains about type mismatch of
function usb_gadget_handle_interrupts(). This function is defined
without parameters in files
  arch/arm/mach-rockchip/board.c
  board/samsung/common/exynos5-dt.c
but it should have one parameter, int index.

Fix this.
Signed-off-by: NMarek Behún <marek.behun@nic.cz>
Reviewed-by: NBin Meng <bmeng.cn@gmail.com>
Reviewed-by: NKever Yang <kever.yang@rock-chips.com>

arch/arm/mach-rockchip/board.c

@@ -139,7 +139,7 @@ static struct dwc3_device dwc3_device_data = {
 	.hsphy_mode = USBPHY_INTERFACE_MODE_UTMIW,
 };
 
-int usb_gadget_handle_interrupts(void)
+int usb_gadget_handle_interrupts(int index)
 {
 	dwc3_uboot_handle_interrupt(0);
 	return 0;

board/samsung/common/exynos5-dt.c

@@ -126,7 +126,7 @@ static struct dwc3_device dwc3_device_data = {
 	.index = 0,
 };
 
-int usb_gadget_handle_interrupts(void)
+int usb_gadget_handle_interrupts(int index)
 {
 	dwc3_uboot_handle_interrupt(0);
 	return 0;