net: Use phys_addr_t for SMC net device addresses

Use same type as eth_device->iobase and support addresses greater
than INT_MAX.

Signed-off-by: Peter Hoyes <Peter.Hoyes@arm.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
3 files changed