The HiSilicon SAS HBA is available in HiSilicon arm64 SoCs only.
Restrict it to arm64, unless compile-testing.
Signed-off-by: NGeert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>