fsl-lsch2: csu: correct the workaround A-010315

The implementation of function set_pcie_ns_access() uses a wrong
argument. The structure array ns_dev has a member 'ind' which is
initialized by CSU_CSLX_*. It should use the 'ind' directly to
address the PCIe's CSL register (CSL_base + CSU_CSLX_PCIE*).

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
[YS: Revise commit message]
Reviewed-by: York Sun <york.sun@nxp.com>