Add code to initialise interrupts and add some interrupt handlers.

Also add function hisi_sas_v3_destroy_irqs() to clean-up irqs upon
module unloading.
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NXiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>