configs: P5040DS: Enable PCIe driver

Enable the DM PCIe driver in P5040DS defconfig.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
eviewed-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>