dm: pcie_fsl: Fix the calculation of controller index

dm: pcie_fsl: Fix the calculation of controller index

The PCIe controller register address in CCSR is different
on various platforms, the current code erroneously use
the hardcoded address (0xffe240000) and stride (0x10000)
to calculate the controller's index.

Fix it by adding the related info to the driver data
structure.

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