dwc3: core: Disable dwc3 IRQ explicitly with dwc3_probe() API

Commit 04c848d3 ("genirq: Warn when IRQ_NOAUTOEN is used with shared
interrupts") added WARN_ON() when driver is requesting shared IRQ after
setting IRQ_NOAUTOEN flag. USB controller interrupt is shared IRQ and
controller driver does use IRQ_NOAUTOEN flag before requesting irq. This
results into WARN_ON() with dwc3_probe(). Fix WARN_ON() by using
disable_irq() explicitly instead of setting IRQ_NOAUTOEN flag.

Change-Id: I1d166d04d724ef0f3cce322dbe80398f51bf894f
Signed-off-by: Mayank Rana <mrana@codeaurora.org>