dfu: scsi: don't call scsi_scan()

dfu: scsi: don't call scsi_scan()

Calling scsi_scan() results in all the block devices (and EFI block
devices) being destroyed and re-created. This breaks the EFI filesystem
drivers during capsule update.

Remove the call, since boards really should be calling scsi_scan()
themselves during board_init().

Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
Link: https://lore.kernel.org/r/20250411-b4-qcom-capsule-update-improvements-v2-3-27f6b2fcc4a9@linaro.org
Signed-off-by: Casey Connolly <casey.connolly@linaro.org>