platform: msm_shared: Send DCS on commands after tg is enabled

Some DSI panels require blank frames to be sent before receiving
the ON commands. This requires DSI to send out all the commands
once MDP is enabled(timging generator enabled).
The following flag needs to be set to enable this mode.

    - pinfo->mipi.cmds_post_tg = 1;

Change-Id: I5d5856cddf96399c1eed0c1523c9747be4e970a4
4 files changed