Several symbols in DesignWare PCI Core driver are used
to support PCIe controller work at Endpoint Mode.
Export them to support such driver built as module.
Bug: 159736148
Signed-off-by: Jindong Yue <jindong.yue@nxp.com>
Change-Id: I2c77bfbfbec750ecdf21f0cd1bbb20fe339a2f0c