arm64: defconfig: Enable PCIEPORTBUS

PCIe features like AER, Hotplug, PME, DPC depend on PCIEPORTBUS,
so enable PCIEPORTBUS as default.

Signed-off-by: Dongdong Liu <liudongdong3@huawei.com>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>