Revert "net: axienet: Wait for PhyRstCmplt after core reset"

This reverts commit 9f1a3c13342b4d96b9baa337ec5fb7d453828709.

The upstream commit b400c2f4f4c5 ("net: axienet: Wait for PhyRstCmplt
after core reset") add new instructions in the `__axienet_device_reset`
function to wait until PhyRstCmplt bit is set, and return a non zero-exit
value if this exceeds a timeout.

However, its backported version in 4.9 (commit 9f1a3c13342b ("net:
axienet: Wait for PhyRstCmplt after core reset")) insert these
instructions in `axienet_dma_bd_init` instead.

Unlike upstream, the version of `__axienet_device_reset` currently present
in branch stable/linux-4.9.y does not return an integer for error codes.
Therefore fixing the backport cannot be as simple as moving the inserted
instructions in the right place, and we simply revert it instead.

Fixes: 9f1a3c13342b ("net: axienet: Wait for PhyRstCmplt after core reset")
Signed-off-by: Guillaume Bertholon <guillaume.bertholon@ens.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>