scsi: aacraid: Fix INTx/MSI-x issue with older controllers

scsi: aacraid: Fix INTx/MSI-x issue with older controllers

BugLink: http://bugs.launchpad.net/bugs/1664960
commit 8af8e1c22f9994bb1849c01d66c24fe23f9bc9a0 upstream.

commit 78cbccd3bd68 ("aacraid: Fix for KDUMP driver hang")

caused a problem on older controllers which do not support MSI-x (namely
ASR3405,ASR3805). This patch conditionalizes the previous patch to
controllers which support MSI-x

Fixes: 78cbccd3bd68 ("aacraid: Fix for KDUMP driver hang")
Reported-by: Arkadiusz Miskiewicz <a.miskiewicz@gmail.com>
Signed-off-by: Dave Carroll <david.carroll@microsemi.com>
Reviewed-by: Raghava Aditya Renukunta <RaghavaAditya.Renukunta@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>