Following changes are included in this commit:
1) CloseBypass will just update one flag.
2) Close channel will be done in disp_loop.
This is needed so that we make sure, close channel happens
only after framebuffer has been sent to MDP.
CRs-fixed: 292152
Change-Id: I1d4b9930ad98fd8c437a3e5641c605842c63a91d