dwc3: Add module param to allow irq affinity to different cpu cores

USB3.0 can generate high number of interrupts during peak data rates.
By default all the interrupts and resulting soft irqs will be
executed on Core0 resulting watchdog barks. Add module param allows
usb interrupt preference to different cpu core.

Change-Id: Ie86b1c4a631986a676692f6464b93fdebf52ecba
Signed-off-by: Vamsi Krishna <vskrishn@codeaurora.org>