net: dsa: b53: per-port interrupts are optional

Make use of platform_get_irq_byname_optional() to avoid printing
messages on the kernel console that interrupts cannot be found.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 file changed