msm: vidc: enable port reconfig for thumbnail session

Send port reconfig to client for thumbnail session
when driver received sufficient resources from firmware.

This is needed as there are issues in DPB management
in firmware.

Change-Id: I7c2992e6be87fd277b209554d1aa7c4d0a088738
Signed-off-by: Paras Nagda <pnagda@codeaurora.org>