soc: qcom: ipc_rtr_xprt: Add support to set version in transport

Currently, there is no option to set the version in IPC Router transport.

Add support to set a version in the transport so that the version can be
modified from initial entry after the version negotiation.

Change-Id: Ie6d823a3b4f2608efe2ac992a248a4f0884b856d
Signed-off-by: Atish Kumar Patra <apatra@codeaurora.org>