Implementations might use different IRQs for
host, gadget so use named interrupt resources
to allow device tree to specify the interrupts.

Following are the interrupt names

Peripheral Interrupt - peripheral
HOST Interrupt - host

Maintain backward compatibility for a single named
interrupt ("dwc3_usb3") for all interrupts as well as
unnamed interrupt at index 0 for all interrupts.

As platform_get_irq() variants are used, tackle
the -EPROBE_DEFER case as well.
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>