ARM: dts: msm: expand iommu-map to support PCIe switch on sdxlemur

Additional BDF to SID mappings are needed if a switch and
mutliple endpoints are connected to PCIe root complex.
Expand iommu-map for PCIe on sdxprarie to support such
a usecase.

Change-Id: I396c535af617c413962049c26209d6ecf30628c5