mlxsw: pci: Rename mlxsw_pci_sw_reset()

In the next patches, mlxsw_pci_sw_reset() will be extended to support
more reset types and will not necessarily issue a software reset. Rename
the function to reflect that.

Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>