msm: pcie: update SMMU SID support on msm-4.9 kernel

On msm-4.9 kernel, PCIe host driver provides a SID to
endpoint BDF mapping in devicetree. SMMU driver uses
this mapping to link a SID to an endpoint making the
previous support obsolete. Update the way PCIe bus
driver supports SID.

Change-Id: Iab6b7f7944ef2515c6a4a111995722255a36a002
Signed-off-by: Tony Truong <truong@codeaurora.org>