hw/scsi/scsi-generic: Fix io_timeout property not applying

hw/scsi/scsi-generic: Fix io_timeout property not applying

The io_timeout property, introduced in c9b6609 (part of 6.0) is
silently overwritten by the hardcoded default value of 30 seconds
(DEFAULT_IO_TIMEOUT) in scsi_generic_realize because that function is
being called after the properties have already been applied.

The property definition already has a default value which is applied
correctly when no value is explicitly set, so we can just remove the
code which overrides the io_timeout completely.

This has been tested by stracing SG_IO operations with the io_timeout
property set and unset and now sets the timeout field in the ioctl
request to the proper value.

Fixes: c9b6609b69facad ("scsi: make io_timeout configurable")
Signed-off-by: Lorenz Brun <lorenz@brun.one>
Message-ID: <20240315145831.2531695-1-lorenz@brun.one>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>