soc: qcom: msm_glink_pkt: Set transport field for device

When smd_trans is registered at bootup and the transport
field is null, glink_pkt gets a link up notification early.
Use the requested transport to register for the link up
notification of the edge.

CRs-Fixed: 1028203
Change-Id: I8f549a48efe19f66e3a336a21b75903f7800ed86
Signed-off-by: Chris Lew <clew@codeaurora.org>