dt-bindings: arm: msm: remove deprecated io and bar entries for PCIe

PCIe root complex driver does not support io and bar entries
as part of the resources which it will remap and access. These
two resources are mapped and accessed directly by the device host
driver.

Also remove optional entries tcsr and rumi in the example code.

Change-Id: I424ec43373f4aaf949a002f0ea69ec2bbccafe18