scsi: pm80xx: Set phy_attached to zero when device is gone

[ Upstream commit f7b705c238d1483f0a766e2b20010f176e5c0fb7 ]

When a fatal error occurs, a phy down event may not be received to set
phy->phy_attached to zero.

Signed-off-by: Igor Pylypiv <ipylypiv@google.com>
Signed-off-by: Salomon Dushimirimana <salomondush@google.com>
Link: https://lore.kernel.org/r/20250319230305.3172920-1-salomondush@google.com


Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>