Merge branch 'wangxun-interrupts'

Jiawen Wu says:

====================
Wangxun interrupt and RxTx support

Configure interrupt, setup RxTx ring, support to receive and transmit
packets.

change log:
v3:
- Use upper_32_bits() to avoid compile warning.
- Remove useless codes.
v2:
- Andrew Lunn: https://lore.kernel.org/netdev/Y86kDphvyHj21IxK@lunn.ch/


- Add a judgment when allocate dma for descriptor.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>