net: phy: ensure phylib state machine is stopped after calling phy_stop

mainline inclusion
from mainline-v5.1-rc1
commit cbfd12b3
category: bugfix
bugzilla: NA
CVE: NA

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The call to the phylib state machine in phy_stop() just ensures that
the state machine isn't re-triggered, but a state machine call may
be scheduled already. So lets's call phy_stop_machine().
This also allows to get rid of the call to phy_stop_machine() in
phy_disconnect().

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Reviewed-by: Weiwei Deng <dengweiwei@huawei.com>
Reviewed-by: Zhaohui Zhong <zhongzhaohui@huawei.com>
Reviewed-by: Yonglong Liu <liuyonglong@huawei.com>
Signed-off-by: You Shengzui <youshengzui@huawei.com>
Reviewed-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>