octeon_ep: add hardware configuration APIs

Implement hardware resource init and shutdown helper APIs.
This includes hardware Tx/Rx queue init/enable/disable/reset,
non queue interrupt handler that decodes non-queue interrupt type.

Signed-off-by: Veerasenareddy Burru <vburru@marvell.com>
Signed-off-by: Abhijit Ayarekar <aayarekar@marvell.com>
Signed-off-by: Satananda Burla <sburla@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>