PCI: kirin: Make struct kirin_pcie_driver static

This was generated from 0-day builder.

Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
[robh: add commit msg]
Signed-off-by: Rob Herring <robh@kernel.org>
[lorenzo.pieralisi@arm.com: reworked the commit log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>