Add cleanup of SMUX port once disconnect event is received by diagfwd driver. CRs-Fixed: 376401 Change-Id: I5ef07c8ccbfcc4ad6c5e41b3d985bdea434ab9ce Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org> Conflicts: drivers/char/diag/diagchar.h Signed-off-by: Neha Pandey <nehap@codeaurora.org>