scsi: hisi_sas: Remove hisi_hba->timer for v3 hw

hisi_hba->timer is not used for v3 hw but there are two places that some
operations related to hisi_hba->timer are called by v3 hw:

 - Deleting the timer in function hisi_sas_v3_hw() which is only for v3 hw;

 - Deleting the timer in function hisi_sas_controller_reset_prepare() which
   is common for v1/v2/v3 hw.

We can remove the timer in the first case, but for the second scenario we
need to remove it only for v3 hw, so check hw->sht which is NULL only for
v3 hw before deleting hisi_hba->timer.

Signed-off-by: Xiang Chen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Martin K. Petersen <[email protected]>

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