usb: modify usb_gadget_handle_interrupts to take controller index

Since we support multiple dwc3 controllers to be existent at the same
time, in order to handle the interrupts of a particular dwc3 controller
usb_gadget_handle_interrutps should take controller index as an
argument.

Hence the API of usb_gadget_handle_interrupts is modified to take
controller index as an argument and made the corresponding changes to all
the usb_gadget_handle_interrupts calls.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Reviewed-by: Lukasz Majewski <l.majewski@samsung.com>
diff --git a/common/cmd_fastboot.c b/common/cmd_fastboot.c
index 346ab80..30bfc9b 100644
--- a/common/cmd_fastboot.c
+++ b/common/cmd_fastboot.c
@@ -31,7 +31,7 @@
 			break;
 		if (ctrlc())
 			break;
-		usb_gadget_handle_interrupts();
+		usb_gadget_handle_interrupts(0);
 	}
 
 	g_dnl_unregister();