Use the new libsas event notifiers API, which requires callers to
explicitly pass the gfp_t memory allocation flags.

Context analysis:

  aic94xx_hwi.c: asd_dl_tasklet_handler()
    -> asd_ascb::tasklet_complete()
    == escb_tasklet_complete()
      -> aic94xx_scb.c: asd_phy_event_tasklet()
      -> aic94xx_scb.c: asd_bytes_dmaed_tasklet()
      -> aic94xx_scb.c: asd_link_reset_err_tasklet()
      -> aic94xx_scb.c: asd_primitive_rcvd_tasklet()

All functions are invoked by escb_tasklet_complete(), which is invoked by
the tasklet handler. Pass GFP_ATOMIC.

Link: https://lore.kernel.org/r/20210118100955.1761652-11-a.darwish@linutronix.deReviewed-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NAhmed S. Darwish <a.darwish@linutronix.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>