net: atlantic: add hw_soft_reset, hw_prepare to hw_ops

A2 will have a different implementation of these 2 APIs, so
this patch moves them to hw_ops in preparation for A2.

Signed-off-by: Mark Starovoytov <mstarovoitov@marvell.com>
Co-developed-by: Dmitry Bezrukov <dbezrukov@marvell.com>
Signed-off-by: Dmitry Bezrukov <dbezrukov@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>