scsi: ufs: core: Always run tx_eqtr POST_CHANGE notify

ufshcd_tx_eqtr() skips POST_CHANGE notify when __ufshcd_tx_eqtr()
fails. That can leave variant cleanup incomplete when PRE_CHANGE saved
temporary state that POST_CHANGE is expected to restore.

Always call POST_CHANGE once PRE_CHANGE has succeeded. Keep the TX EQTR
result as the primary return value, and only propagate POST_CHANGE failure
when TX EQTR itself succeeded.

Log PRE_CHANGE and POST_CHANGE notify failures to make variant callback
failures visible in TX EQTR error paths.

Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>
Reviewed-by: Peter Wang <peter.wang@mediatek.com>
Signed-off-by: Can Guo <can.guo@oss.qualcomm.com>
Reviewed-by: Bean Huo <beanhuo@micron.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Ziqi Chen <ziqi.chen@oss.qualcomm.com>
Link: https://patch.msgid.link/20260625121306.1655467-4-can.guo@oss.qualcomm.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

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